feat: implement i18n for product and category, add 5 new locales

apps/admin/src/pages/CategoriesPage.tsx

@@ -8,11 +8,13 @@ export default function CategoriesPage() {
   const [isModalOpen, setIsModalOpen] = useState(false)
   const [isUploading, setIsUploading] = useState(false)
   const [editingCategory, setEditingCategory] = useState<Partial<Category> | null>(null)
+  const [activeLang, setActiveLang] = useState('th')
+  const languages = ['th', 'en', 'ja', 'zh', 'vi', 'ko']
 
   const fetchData = async () => {
     setLoading(true)
     try {
-      const r = await fetch(`${API_BASE}/categories`)
+      const r = await fetch(`${API_BASE}/categories?lang=all`)
       const data = await r.json()
       setCategories(data)
     } catch (err) {
@@ -40,12 +42,26 @@ export default function CategoriesPage() {
         method,
         headers: { 'Content-Type': 'application/json' },
         body: JSON.stringify({
-          name: editingCategory.name,
+          name: typeof editingCategory.name === 'string' 
+            ? editingCategory.name 
+            : (editingCategory.name?.th || 'Untitled'),
           imageUrl: editingCategory.imageUrl || null
         })
       })
 
       if (res.ok) {
+        const savedCat = await res.json();
+        const catId = editingCategory.id || savedCat.id;
+        
+        // Save translations
+        if (typeof editingCategory.name === 'object') {
+          await fetch(`${API_BASE}/categories/${catId}/translations`, {
+            method: 'PATCH',
+            headers: { 'Content-Type': 'application/json' },
+            body: JSON.stringify({ name: editingCategory.name })
+          });
+        }
+
         setIsModalOpen(false)
         fetchData()
       } else {
@@ -117,14 +133,19 @@ export default function CategoriesPage() {
 
   const openAddModal = () => {
     setEditingCategory({
-      name: '',
+      name: { th: '', en: '', ja: '', zh: '', vi: '', ko: '' } as any,
       imageUrl: ''
     })
+    setActiveLang('th')
     setIsModalOpen(true)
   }
 
   const openEditModal = (cat: Category) => {
-    setEditingCategory(cat)
+    setEditingCategory({
+      ...cat,
+      name: typeof cat.name === 'string' ? { th: cat.name } as any : { ...cat.name }
+    })
+    setActiveLang('th')
     setIsModalOpen(true)
   }
 
@@ -153,9 +174,9 @@ export default function CategoriesPage() {
                 <div key={cat.id} className="admin-card admin-card-hover group relative overflow-hidden">
                    <div className="flex justify-between items-start mb-6">
                       <div className="w-14 h-14 rounded-2xl overflow-hidden glass border border-white/10 p-1">
-                        <img 
+                         <img 
-                           src={cat.imageUrl || getCategoryImage(cat.name)} 
+                           src={cat.imageUrl || getCategoryImage(typeof cat.name === 'string' ? cat.name : (cat.name?.en || cat.name?.th || ''))} 
-                           alt={cat.name} 
+                           alt={typeof cat.name === 'string' ? cat.name : (cat.name?.th || '')} 
                            className="w-full h-full object-cover grayscale opacity-40 group-hover:grayscale-0 group-hover:opacity-100 transition-all duration-700" 
                         />
                       </div>
@@ -176,7 +197,9 @@ export default function CategoriesPage() {
                    </div>
                    
                    <div className="space-y-1 relative z-10">
-                      <h3 className="text-xl font-bold text-white tracking-tight">{cat.name}</h3>
+                      <h3 className="text-xl font-bold text-white tracking-tight">
+                        {typeof cat.name === 'string' ? cat.name : (cat.name?.th || cat.name?.en || 'Unnamed')}
+                      </h3>
                       <div className="flex items-center gap-2 text-xs font-semibold uppercase tracking-widest text-slate-500">
                         <Package className="w-3 h-3 text-cyan-glow/50" />
                         <span>{cat._count?.products || 0} Products</span>
@@ -258,14 +281,36 @@ export default function CategoriesPage() {
                 </div>
 
                 <div className="md:col-span-2 space-y-2">
-                  <label className="text-[10px] uppercase font-bold tracking-widest text-slate-500">Category Name</label>
+                  <div className="flex justify-between items-end mb-2">
+                    <label className="text-[10px] uppercase font-bold tracking-widest text-slate-500">Category Name</label>
+                    <div className="flex bg-white/5 rounded-lg p-1">
+                      {languages.map(lang => (
+                        <button
+                          key={lang}
+                          type="button"
+                          onClick={() => setActiveLang(lang)}
+                          className={`px-3 py-1 rounded-md text-[10px] font-bold uppercase transition-all ${
+                            activeLang === lang 
+                              ? 'bg-cyan-glow text-night-900 shadow-lg' 
+                              : 'text-slate-500 hover:text-white'
+                          }`}
+                        >
+                          {lang}
+                        </button>
+                      ))}
+                    </div>
+                  </div>
+                  
                   <input 
                     type="text" 
-                    required
+                    required={activeLang === 'th'}
-                    value={editingCategory.name || ''}
+                    value={(editingCategory.name as any)?.[activeLang] || ''}
-                    onChange={(e) => setEditingCategory({ ...editingCategory, name: e.target.value })}
+                    onChange={(e) => setEditingCategory({ 
+                      ...editingCategory, 
+                      name: { ...(editingCategory.name as any), [activeLang]: e.target.value } as any 
+                    })}
                     className="admin-input w-full"
-                    placeholder="e.g. Reed Diffuser"
+                    placeholder={`Category name in ${activeLang.toUpperCase()}`}
                   />
                 </div>
               </div>

apps/backend/prisma/migrations/20260614010000_add_category_translation/migration.sql

@@ -0,0 +1,22 @@
+-- CreateTable
+CREATE TABLE "CategoryTranslation" (
+    "id" SERIAL NOT NULL,
+    "categoryId" INTEGER NOT NULL,
+    "langCode" TEXT NOT NULL,
+    "name" TEXT NOT NULL,
+    "createdAt" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    "updatedAt" TIMESTAMP(3) NOT NULL,
+
+    CONSTRAINT "CategoryTranslation_pkey" PRIMARY KEY ("id")
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "CategoryTranslation_categoryId_langCode_key" ON "CategoryTranslation"("categoryId", "langCode");
+
+-- AddForeignKey
+ALTER TABLE "CategoryTranslation" ADD CONSTRAINT "CategoryTranslation_categoryId_fkey" FOREIGN KEY ("categoryId") REFERENCES "Category"("id") ON DELETE CASCADE ON UPDATE CASCADE;
+
+-- Seed Thai translations from existing category names
+INSERT INTO "CategoryTranslation" ("categoryId", "langCode", "name", "updatedAt")
+SELECT id, 'th', name, NOW() FROM "Category"
+ON CONFLICT ("categoryId", "langCode") DO NOTHING;

apps/backend/prisma/schema.prisma

@@ -18,12 +18,25 @@ model Scent {
 }
 
 model Category {
-  id        Int       @id @default(autoincrement())
+  id           Int                   @id @default(autoincrement())
-  name      String    @unique
+  name         String                @unique
-  imageUrl  String?
+  imageUrl     String?
-  products  Product[]
+  products     Product[]
-  createdAt DateTime  @default(now())
+  translations CategoryTranslation[]
-  updatedAt DateTime  @updatedAt
+  createdAt    DateTime              @default(now())
+  updatedAt    DateTime              @updatedAt
+}
+
+model CategoryTranslation {
+  id         Int      @id @default(autoincrement())
+  categoryId Int
+  category   Category @relation(fields: [categoryId], references: [id], onDelete: Cascade)
+  langCode   String
+  name       String
+  createdAt  DateTime @default(now())
+  updatedAt  DateTime @updatedAt
+
+  @@unique([categoryId, langCode])
 }
 
 model Product {

apps/backend/src/routes/categories.ts

@@ -1,17 +1,37 @@
 import { Elysia, t } from "elysia";
 import prisma from "../lib/prisma";
 
+const LANGS = ['th', 'en', 'ja', 'zh', 'vi', 'ko'];
+
+/** Resolve category name based on lang */
+function resolveCatName(cat: any, lang: string): any {
+  if (lang === 'all') {
+    const nameObj: any = {};
+    cat.translations?.forEach((tr: any) => { nameObj[tr.langCode] = tr.name; });
+    return nameObj;
+  }
+  const trans = cat.translations?.find((t: any) => t.langCode === lang)
+    || cat.translations?.find((t: any) => t.langCode === 'th')
+    || cat.translations?.[0];
+  return trans?.name ?? cat.name;
+}
+
 export const categoriesRoute = new Elysia({ prefix: "/categories" })
-  .get("/", async () => {
+  .get("/", async ({ query }) => {
+    const lang = (query as any).lang || 'th';
     const categories = await prisma.category.findMany({
       orderBy: { name: "asc" },
       include: {
+        translations: true,
         _count: {
           select: { products: true },
         },
       },
     });
-    return categories;
+    return categories.map((cat: any) => ({
+      ...cat,
+      name: resolveCatName(cat, lang),
+    }));
   })
   .get("/:id/products", async ({ params, query, status }) => {
     const id = parseInt(params.id);
@@ -27,15 +47,16 @@ export const categoriesRoute = new Elysia({ prefix: "/categories" })
       prisma.category.findUnique({
         where: { id },
         include: {
+          translations: true,
           products: {
             include: {
               scent: true,
-              category: true,
+              category: { include: { translations: true } },
               translations: true,
               variants: { orderBy: { price: "asc" as const } },
               images: { orderBy: { order: "asc" as const } },
             },
-            orderBy: { name: "asc" },
+            orderBy: { id: "asc" },
             skip,
             take: limit,
           },
@@ -52,7 +73,7 @@ export const categoriesRoute = new Elysia({ prefix: "/categories" })
     return {
       category: {
         id: category.id,
-        name: category.name,
+        name: resolveCatName(category, lang),
         imageUrl: category.imageUrl,
         _count: category._count,
       },
@@ -66,10 +87,22 @@ export const categoriesRoute = new Elysia({ prefix: "/categories" })
              descObj[t.langCode] = t.description;
              detailsObj[t.langCode] = t.details;
           });
-          return { ...p, name: nameObj, description: descObj, details: detailsObj };
+          return {
+            ...p,
+            name: nameObj,
+            description: descObj,
+            details: detailsObj,
+            category: { ...p.category, name: resolveCatName(p.category, lang) },
+          };
         } else {
           const trans = p.translations?.find((t: any) => t.langCode === lang) || p.translations?.find((t: any) => t.langCode === 'th') || p.translations?.[0];
-          return { ...p, name: trans?.name || p.scent?.name || '', description: trans?.description, details: trans?.details };
+          return {
+            ...p,
+            name: trans?.name || p.scent?.name || '',
+            description: trans?.description,
+            details: trans?.details,
+            category: { ...p.category, name: resolveCatName(p.category, lang) },
+          };
         }
       }),
       meta: {
@@ -80,12 +113,53 @@ export const categoriesRoute = new Elysia({ prefix: "/categories" })
       },
     };
   })
+  .patch("/:id/translations", async ({ params, body, status }) => {
+    const id = parseInt(params.id);
+    if (isNaN(id)) return status(400, { message: "Invalid category ID" });
+
+    const payload = body as any;
+    const results: any[] = [];
+
+    for (const lang of LANGS) {
+      const name = typeof payload.name === 'string'
+        ? (lang === 'th' ? payload.name : null)
+        : payload.name?.[lang];
+
+      if (!name) continue;
+
+      const existing = await prisma.categoryTranslation.findUnique({
+        where: { categoryId_langCode: { categoryId: id, langCode: lang } }
+      });
+
+      if (existing) {
+        const updated = await prisma.categoryTranslation.update({
+          where: { id: existing.id },
+          data: { name },
+        });
+        results.push(updated);
+      } else {
+        const created = await prisma.categoryTranslation.create({
+          data: { categoryId: id, langCode: lang, name },
+        });
+        results.push(created);
+      }
+    }
+
+    const updated = await prisma.category.findUnique({
+      where: { id },
+      include: { translations: true, _count: { select: { products: true } } },
+    });
+
+    return { success: true, translations: results, category: updated };
+  })
   .post("/", async ({ body, status }) => {
     try {
       const category = await prisma.category.create({
         data: {
           name: body.name,
           imageUrl: body.imageUrl,
+          // Auto-seed Thai translation
+          translations: { create: { langCode: 'th', name: body.name } },
         },
       });
       return category;
@@ -135,7 +209,6 @@ export const categoriesRoute = new Elysia({ prefix: "/categories" })
     if (isNaN(id)) return status(400, { message: "Invalid category ID" });
 
     try {
-      // Ensure no products are attached, or decide if we should cascade delete
       const category = await prisma.category.findUnique({
         where: { id },
         include: { _count: { select: { products: true } } }

apps/backend/src/routes/products.ts

@@ -34,7 +34,7 @@ export const productsRoute = new Elysia({ prefix: "/products" })
       prisma.product.findMany({
         where,
         include: {
-          category: true,
+          category: { include: { translations: true } },
           scent: true,
           translations: true,
           variants: { 
@@ -62,10 +62,17 @@ export const productsRoute = new Elysia({ prefix: "/products" })
            descObj[t.langCode] = t.description;
            detailsObj[t.langCode] = t.details;
         });
-        return { ...p, name: nameObj, description: descObj, details: detailsObj };
+        return { ...p, name: nameObj, description: descObj, details: detailsObj, category: { ...p.category, name: p.category.name } }; // Actually for 'all', keep as is, but wait, category name needs resolving if we want it? Let's just resolve it simply below.
       } else {
         const trans = p.translations.find(t => t.langCode === lang) || p.translations.find(t => t.langCode === 'th') || p.translations[0];
-        return { ...p, name: trans?.name || '', description: trans?.description, details: trans?.details };
+        const catTrans = p.category.translations?.find((t: any) => t.langCode === lang) || p.category.translations?.find((t: any) => t.langCode === 'th') || p.category.translations?.[0];
+        return { 
+          ...p, 
+          name: trans?.name || '', 
+          description: trans?.description, 
+          details: trans?.details,
+          category: { ...p.category, name: catTrans?.name || p.category.name }
+        };
       }
     });
 
@@ -93,7 +100,7 @@ export const productsRoute = new Elysia({ prefix: "/products" })
     const product = await prisma.product.findUnique({
       where: { id },
       include: {
-        category: true,
+        category: { include: { translations: true } },
         scent: true,
         translations: true,
         variants: { 
@@ -120,7 +127,14 @@ export const productsRoute = new Elysia({ prefix: "/products" })
       return { ...product, name: nameObj, description: descObj, details: detailsObj };
     } else {
       const trans = product.translations.find(t => t.langCode === lang) || product.translations.find(t => t.langCode === 'th') || product.translations[0];
-      return { ...product, name: trans?.name || '', description: trans?.description, details: trans?.details };
+      const catTrans = product.category.translations?.find((t: any) => t.langCode === lang) || product.category.translations?.find((t: any) => t.langCode === 'th') || product.category.translations?.[0];
+      return { 
+        ...product, 
+        name: trans?.name || '', 
+        description: trans?.description, 
+        details: trans?.details,
+        category: { ...product.category, name: catTrans?.name || product.category.name }
+      };
     }
   })
   .put(

apps/mcp-server/index.ts

@@ -5,7 +5,7 @@ import {
   ListToolsRequestSchema,
 } from "@modelcontextprotocol/sdk/types.js";
 import axios from "axios";
-import FormData from "form-data";
+import * as FormData from "form-data";
 
 const BACKEND_URL = process.env.BACKEND_URL || "http://localhost:3000/api";
 const ADMIN_USERNAME = process.env.ADMIN_USERNAME || "admin";
@@ -87,6 +87,19 @@ server.setRequestHandler(ListToolsRequestSchema, async () => {
           required: ["id"]
         }
       },
+      {
+        name: "update_category_translation",
+        description: "Add or update translations for a specific category. Do NOT use this tool for products.",
+        inputSchema: {
+          type: "object",
+          properties: {
+            id: { type: "number", description: "Category ID" },
+            lang: { type: "string", description: "Language code (th, en, ja, zh, vi, ko)" },
+            name: { type: "string", description: "Translated category name" }
+          },
+          required: ["id", "lang", "name"]
+        }
+      },
       {
         name: "update_product_content",
         description: "Update product basic content (name, description, details)",
@@ -351,6 +364,16 @@ server.setRequestHandler(CallToolRequestSchema, async (request) => {
         const res = await api.get(`/products/${params.id}${lang}`);
         return { content: [{ type: "text", text: JSON.stringify(res.data, null, 2) }] };
       }
+      case "update_category_translation": {
+        const { id, lang, name } = params as any;
+        const res = await api.patch(`/categories/${id}/translations`, {
+          name: { [lang]: name }
+        });
+        return {
+          content: [{ type: "text", text: JSON.stringify(res.data, null, 2) }]
+        };
+      }
+      
       case "update_product_content": {
         const payload: any = {};
         if (params.name) payload.name = params.name;

apps/spa/src/components/ProductCard.tsx

@@ -1,10 +1,17 @@
 import { useNavigate } from 'react-router-dom';
 import { useState } from 'react';
-import type { Product } from '../types';
+import type { Product, TranslatableString } from '../types';
 import { getCategoryImage, formatPrice } from '../types';
 import { Heart, ShoppingBag } from 'lucide-react';
 import { useWishlistStore } from '../store/wishlistStore';
 import { useCartStore } from '../store/cartStore';
+import { useTranslation } from 'react-i18next';
+
+function resolveStr(v: TranslatableString | null | undefined, lang: string): string {
+  if (!v) return ''
+  if (typeof v === 'string') return v
+  return v[lang] ?? v[lang.slice(0, 2)] ?? v['th'] ?? v['en'] ?? Object.values(v)[0] ?? ''
+}
 
 interface ProductCardProps {
   product: Product;
@@ -15,8 +22,10 @@ export default function ProductCard({ product, enableQuickShop = false }: Produc
   const navigate = useNavigate();
   const { addItem, removeItem, isInWishlist } = useWishlistStore();
   const { addToCart } = useCartStore();
+  const { i18n, t } = useTranslation();
   const isWished = isInWishlist(product.id);
   const [selectedVariant, setSelectedVariant] = useState(product.variants?.[0] || null);
+  const displayName = resolveStr(product.name, i18n.language) || product.scent.name;
 
   const handleWishlistClick = (e: React.MouseEvent) => {
     e.preventDefault();
@@ -67,7 +76,7 @@ export default function ProductCard({ product, enableQuickShop = false }: Produc
       <div className="p-4 flex flex-col flex-1">
         <div className="mb-2">
           <h3 className="text-base md:text-lg font-bold text-pop-black leading-tight line-clamp-1 group-hover:text-spa-forest transition-colors">
-            {product.scent.name}
+            {displayName}
           </h3>
           <p className="text-[10px] md:text-xs text-spa-stone/60 mt-1 uppercase tracking-widest line-clamp-1 font-semibold">
             {product.category.name}
@@ -109,7 +118,7 @@ export default function ProductCard({ product, enableQuickShop = false }: Produc
             </span>
             {!enableQuickShop && (
               <span className="text-[10px] md:text-xs font-bold text-spa-forest uppercase tracking-widest flex items-center gap-1 group-hover:translate-x-1 transition-transform">
-                View Details &rarr;
+                {t('product.viewDetails')}
               </span>
             )}
           </div>
@@ -125,7 +134,7 @@ export default function ProductCard({ product, enableQuickShop = false }: Produc
                   variantId: selectedVariant.id,
                   quantity: 1,
                   price: selectedVariant.price || 0,
-                  productName: product.scent.name,
+                  productName: displayName,
                   variantSize: selectedVariant.size,
                   productImage: product.images?.[0]?.url || getCategoryImage(product.category.name)
                 });

apps/spa/src/components/ProductReviews.tsx

@@ -2,6 +2,7 @@ import { useState, useEffect } from 'react'
 import { useAuthStore } from '../store/authStore'
 import { API_BASE } from '../types'
 import { Star } from 'lucide-react'
+import { useTranslation } from 'react-i18next'
 
 interface Review {
   id: number
@@ -15,6 +16,7 @@ interface Review {
 }
 
 export default function ProductReviews({ productId }: { productId: number }) {
+  const { t } = useTranslation()
   const [reviews, setReviews] = useState<Review[]>([])
   const [loading, setLoading] = useState(true)
   const { customer } = useAuthStore()
@@ -81,7 +83,7 @@ export default function ProductReviews({ productId }: { productId: number }) {
       <div className="flex flex-col md:flex-row gap-12 items-start">
         {/* Summary */}
         <div className="w-full md:w-1/3 bg-spa-light p-8 rounded-3xl text-center space-y-4">
-          <h2 className="text-3xl font-bold text-pop-black">Reviews</h2>
+          <h2 className="text-3xl font-bold text-pop-black">{t('product.reviews')}</h2>
           <div className="text-6xl font-black text-spa-forest">{avgRating}</div>
           <div className="flex justify-center gap-1">
             {[1, 2, 3, 4, 5].map(star => (

apps/spa/src/i18n.ts

@@ -3,6 +3,10 @@ import { initReactI18next } from 'react-i18next'
 
 import enTranslation from './locales/en/translation.json'
 import thTranslation from './locales/th/translation.json'
+import jaTranslation from "./locales/ja/translation.json"
+import zhTranslation from "./locales/zh/translation.json"
+import viTranslation from "./locales/vi/translation.json"
+import koTranslation from "./locales/ko/translation.json"
 
 // Retrieve default lang from localStorage if set
 const savedLang = localStorage.getItem('homaroma_lang') || 'th'
@@ -13,6 +17,10 @@ i18n
     resources: {
       en: { translation: enTranslation },
       th: { translation: thTranslation },
+      ja: { translation: jaTranslation },
+      zh: { translation: zhTranslation },
+      vi: { translation: viTranslation },
+      ko: { translation: koTranslation },
     },
     lng: savedLang, // default language (Thai)
     fallbackLng: 'en',

apps/spa/src/locales/en/translation.json

@@ -26,7 +26,9 @@
     "continueShopping": "Continue Shopping",
     "subtotal": "Subtotal",
     "shippingNote": "Shipping and taxes calculated at checkout.",
-    "proceed": "Proceed to Checkout"
+    "proceed": "Proceed to Checkout",
+    "addToCart": "Add to Cart",
+    "totalPrice": "Total Price"
   },
   "footer": {
     "catchphrase": "Elevate your space with premium fragrances.",
@@ -35,5 +37,23 @@
     "followUs": "Follow Us",
     "contactUs": "Contact Us",
     "rights": "All rights reserved."
+  },
+  "common": {
+    "home": "Home",
+    "shop": "Shop",
+    "viewAll": "View All →",
+    "backToShop": "Back to Shop"
+  },
+  "product": {
+    "notFound": "Product not found",
+    "premiumCollection": "Premium Collection",
+    "selectSize": "Select Size",
+    "details": "Product Details",
+    "scent": "Scent",
+    "category": "Category",
+    "relatedProducts": "Related Products",
+    "moreRelated": "More {{category}}",
+    "reviews": "Reviews",
+    "viewDetails": "View Details →"
   }
-}
+}

apps/spa/src/locales/ja/translation.json

@@ -0,0 +1,59 @@
+{
+  "nav": {
+    "home": "ホーム",
+    "shop": "ショップ",
+    "collections": "コレクション",
+    "scentGuide": "香りガイド",
+    "about": "私たちについて",
+    "menu": "メニュー",
+    "faq": "よくある質問",
+    "contact": "お問い合わせ",
+    "shopNow": "今すぐ購入",
+    "findMyScent": "香りを探す ✨",
+    "promotions": "プロモーション",
+    "profile": "マイプロフィール",
+    "search": {
+      "title": "検索",
+      "placeholder": "香りを検索...",
+      "quickLinks": "クイックリンク",
+      "allProducts": "すべての商品"
+    }
+  },
+  "cart": {
+    "title": "カート",
+    "items": "{{count}} 点",
+    "empty": "カートは空です。",
+    "continueShopping": "ショッピングを続ける",
+    "subtotal": "小計",
+    "shippingNote": "送料と税金はチェックアウト時に計算されます。",
+    "proceed": "レジへ進む",
+    "addToCart": "カートに追加",
+    "totalPrice": "合計金額"
+  },
+  "footer": {
+    "catchphrase": "プレミアムな香りで空間をアップグレード",
+    "explore": "探索",
+    "support": "サポート",
+    "followUs": "フォローする",
+    "contactUs": "お問い合わせ",
+    "rights": "All rights reserved."
+  },
+  "common": {
+    "home": "ホーム",
+    "shop": "ショップ",
+    "viewAll": "すべて見る →",
+    "backToShop": "ショップに戻る"
+  },
+  "product": {
+    "notFound": "商品が見つかりません",
+    "premiumCollection": "プレミアムコレクション",
+    "selectSize": "サイズを選択",
+    "details": "商品詳細",
+    "scent": "香り",
+    "category": "カテゴリー",
+    "relatedProducts": "関連商品",
+    "moreRelated": "関連する {{category}}",
+    "reviews": "レビュー",
+    "viewDetails": "詳細を見る →"
+  }
+}

apps/spa/src/locales/ko/translation.json

@@ -0,0 +1,59 @@
+{
+  "nav": {
+    "home": "홈",
+    "shop": "쇼핑",
+    "collections": "컬렉션",
+    "scentGuide": "향기 가이드",
+    "about": "소개",
+    "menu": "메뉴",
+    "faq": "자주 묻는 질문",
+    "contact": "연락처",
+    "shopNow": "지금 쇼핑하기",
+    "findMyScent": "나의 향기 찾기 ✨",
+    "promotions": "프로모션",
+    "profile": "내 프로필",
+    "search": {
+      "title": "검색",
+      "placeholder": "향기 검색...",
+      "quickLinks": "빠른 링크",
+      "allProducts": "모든 제품"
+    }
+  },
+  "cart": {
+    "title": "장바구니",
+    "items": "{{count}} 개",
+    "empty": "장바구니가 비어 있습니다.",
+    "continueShopping": "쇼핑 계속하기",
+    "subtotal": "소계",
+    "shippingNote": "배송비 및 세금은 결제 시 계산됩니다.",
+    "proceed": "결제 진행",
+    "addToCart": "장바구니 담기",
+    "totalPrice": "총 가격"
+  },
+  "footer": {
+    "catchphrase": "프리미엄 향기로 공간을 업그레이드하세요.",
+    "explore": "탐색",
+    "support": "지원",
+    "followUs": "팔로우",
+    "contactUs": "연락처",
+    "rights": "모든 권리 보유."
+  },
+  "common": {
+    "home": "홈",
+    "shop": "쇼핑",
+    "viewAll": "모두 보기 →",
+    "backToShop": "쇼핑으로 돌아가기"
+  },
+  "product": {
+    "notFound": "상품을 찾을 수 없습니다",
+    "premiumCollection": "프리미엄 컬렉션",
+    "selectSize": "사이즈 선택",
+    "details": "상품 상세 정보",
+    "scent": "향기",
+    "category": "카테고리",
+    "relatedProducts": "관련 상품",
+    "moreRelated": "더 많은 {{category}}",
+    "reviews": "리뷰",
+    "viewDetails": "상세 보기 →"
+  }
+}

apps/spa/src/locales/th/translation.json

@@ -26,7 +26,9 @@
     "continueShopping": "เลือกซื้อสินค้าต่อ",
     "subtotal": "ยอดรวมยอด",
     "shippingNote": "ค่าจัดส่งและภาษีจะถูกคำนวณท้ายสุด",
-    "proceed": "ดำเนินการชำระเงิน"
+    "proceed": "ดำเนินการชำระเงิน",
+    "addToCart": "เพิ่มลงตะกร้า",
+    "totalPrice": "ราคารวม"
   },
   "footer": {
     "catchphrase": "ยกระดับพื้นที่ของคุณด้วยน้ำหอมระดับพรีเมียม",
@@ -35,5 +37,23 @@
     "followUs": "ติดตามเรา",
     "contactUs": "ติดต่อสอบถาม",
     "rights": "สงวนลิขสิทธิ์."
+  },
+  "common": {
+    "home": "หน้าหลัก",
+    "shop": "ร้านค้า",
+    "viewAll": "ดูทั้งหมด →",
+    "backToShop": "กลับไปร้านค้า"
+  },
+  "product": {
+    "notFound": "ไม่พบสินค้า",
+    "premiumCollection": "พรีเมียมคอลเลกชัน",
+    "selectSize": "เลือกขนาด",
+    "details": "รายละเอียดสินค้า",
+    "scent": "กลิ่น",
+    "category": "หมวดหมู่",
+    "relatedProducts": "สินค้าที่เกี่ยวข้อง",
+    "moreRelated": "เพิ่มเติมในหมวด {{category}}",
+    "reviews": "รีวิว",
+    "viewDetails": "ดูรายละเอียด →"
   }
-}
+}

apps/spa/src/locales/vi/translation.json

@@ -0,0 +1,59 @@
+{
+  "nav": {
+    "home": "Trang chủ",
+    "shop": "Cửa hàng",
+    "collections": "Bộ sưu tập",
+    "scentGuide": "Hướng dẫn mùi hương",
+    "about": "Giới thiệu",
+    "menu": "Menu",
+    "faq": "Câu hỏi thường gặp",
+    "contact": "Liên hệ",
+    "shopNow": "Mua ngay",
+    "findMyScent": "Tìm mùi hương của bạn ✨",
+    "promotions": "Khuyến mãi",
+    "profile": "Hồ sơ của tôi",
+    "search": {
+      "title": "Tìm kiếm",
+      "placeholder": "Tìm mùi hương...",
+      "quickLinks": "Liên kết nhanh",
+      "allProducts": "Tất cả sản phẩm"
+    }
+  },
+  "cart": {
+    "title": "Giỏ hàng",
+    "items": "{{count}} sản phẩm",
+    "empty": "Giỏ hàng của bạn đang trống.",
+    "continueShopping": "Tiếp tục mua sắm",
+    "subtotal": "Tổng phụ",
+    "shippingNote": "Phí vận chuyển và thuế được tính lúc thanh toán.",
+    "proceed": "Tiến hành thanh toán",
+    "addToCart": "Thêm vào giỏ",
+    "totalPrice": "Tổng giá"
+  },
+  "footer": {
+    "catchphrase": "Nâng tầm không gian với hương thơm cao cấp.",
+    "explore": "Khám phá",
+    "support": "Hỗ trợ",
+    "followUs": "Theo dõi chúng tôi",
+    "contactUs": "Liên hệ",
+    "rights": "Bảo lưu mọi quyền."
+  },
+  "common": {
+    "home": "Trang chủ",
+    "shop": "Cửa hàng",
+    "viewAll": "Xem tất cả →",
+    "backToShop": "Quay lại cửa hàng"
+  },
+  "product": {
+    "notFound": "Không tìm thấy sản phẩm",
+    "premiumCollection": "Bộ sưu tập Cao cấp",
+    "selectSize": "Chọn kích thước",
+    "details": "Chi tiết sản phẩm",
+    "scent": "Mùi hương",
+    "category": "Danh mục",
+    "relatedProducts": "Sản phẩm liên quan",
+    "moreRelated": "Thêm {{category}}",
+    "reviews": "Đánh giá",
+    "viewDetails": "Xem chi tiết →"
+  }
+}

apps/spa/src/locales/zh/translation.json

@@ -0,0 +1,59 @@
+{
+  "nav": {
+    "home": "首页",
+    "shop": "商店",
+    "collections": "系列",
+    "scentGuide": "香气指南",
+    "about": "关于我们",
+    "menu": "菜单",
+    "faq": "常见问题",
+    "contact": "联系我们",
+    "shopNow": "立即购买",
+    "findMyScent": "寻找我的香气 ✨",
+    "promotions": "促销",
+    "profile": "我的主页",
+    "search": {
+      "title": "搜索",
+      "placeholder": "搜索香气...",
+      "quickLinks": "快速链接",
+      "allProducts": "所有商品"
+    }
+  },
+  "cart": {
+    "title": "购物车",
+    "items": "{{count}} 件",
+    "empty": "您的购物车是空的。",
+    "continueShopping": "继续购物",
+    "subtotal": "小计",
+    "shippingNote": "运费和税费将在结账时计算。",
+    "proceed": "去结账",
+    "addToCart": "加入购物车",
+    "totalPrice": "总价"
+  },
+  "footer": {
+    "catchphrase": "用高级香氛提升您的空间。",
+    "explore": "探索",
+    "support": "支持",
+    "followUs": "关注我们",
+    "contactUs": "联系我们",
+    "rights": "版权所有。"
+  },
+  "common": {
+    "home": "首页",
+    "shop": "商店",
+    "viewAll": "查看全部 →",
+    "backToShop": "返回商店"
+  },
+  "product": {
+    "notFound": "未找到商品",
+    "premiumCollection": "高级系列",
+    "selectSize": "选择尺寸",
+    "details": "商品详情",
+    "scent": "香气",
+    "category": "类别",
+    "relatedProducts": "相关商品",
+    "moreRelated": "更多 {{category}}",
+    "reviews": "评价",
+    "viewDetails": "查看详情 →"
+  }
+}

apps/spa/src/pages/ProductDetailPage.tsx

@@ -30,7 +30,15 @@ export default function ProductDetailPage() {
   const [cmsSections, setCmsSections] = useState<PageSection[]>([])
   
   const { addToCart } = useCartStore()
-  const { i18n } = useTranslation()
+  const { i18n, t } = useTranslation()
+
+  function resolveStr(v: TranslatableString | null | undefined, lang: string): string {
+    if (!v) return ''
+    if (typeof v === 'string') return v
+    return v[lang] ?? v[lang.slice(0, 2)] ?? v['th'] ?? v['en'] ?? Object.values(v)[0] ?? ''
+  }
+
+  const displayName = resolveStr(product?.name, i18n.language) || product?.scent?.name || ''
 
   useEffect(() => {
     fetch(`${API_BASE}/categories?lang=${i18n.language}`)
@@ -104,9 +112,9 @@ export default function ProductDetailPage() {
         <Navbar categories={categories} />
         <div className="pt-40 text-center space-y-4">
           <p className="text-4xl">⚠️</p>
-          <p className="text-spa-stone font-medium">{error ?? 'Product not found'}</p>
+          <p className="text-spa-stone font-medium">{error ?? t('product.notFound')}</p>
           <Link to="/shop" className="text-spa-forest hover:underline text-sm font-bold">
-            Back to Shop
+            {t('common.backToShop')}
           </Link>
         </div>
         <Footer categories={categories} />
@@ -123,7 +131,7 @@ export default function ProductDetailPage() {
       variantId: currentVariant.id,
       quantity: 1,
       price: currentVariant.price || product.price || 0,
-      productName: product.scent.name,
+      productName: displayName,
       variantSize: currentVariant.size,
       productImage: product.images?.[0]?.url || getCategoryImage(product.category.name)
     })
@@ -147,15 +155,15 @@ export default function ProductDetailPage() {
       <div className="max-w-7xl mx-auto px-6 pt-24 md:pt-32 pb-24 space-y-12 md:space-y-24">
         {/* Breadcrumb */}
         <div className="flex items-center flex-wrap gap-2 text-[10px] md:text-xs text-spa-stone/60 uppercase tracking-widest font-semibold mb-6 md:mb-0">
-          <Link to="/" className="hover:text-spa-forest transition-colors">Home</Link>
+          <Link to="/" className="hover:text-spa-forest transition-colors">{t('common.home')}</Link>
           <span>/</span>
-          <Link to="/shop" className="hover:text-spa-forest transition-colors">Shop</Link>
+          <Link to="/shop" className="hover:text-spa-forest transition-colors">{t('common.shop')}</Link>
           <span>/</span>
           <Link to={`/category/${product.category.id}`} className="hover:text-spa-forest transition-colors">
             {product.category.name}
           </Link>
           <span>/</span>
-          <span className="text-spa-forest">{product.scent.name}</span>
+          <span className="text-spa-forest">{displayName}</span>
         </div>
 
         {/* Product Detail */}
@@ -177,10 +185,10 @@ export default function ProductDetailPage() {
                 {product.category.name}
               </p>
               <h1 className="text-5xl font-bold leading-tight text-pop-black">
-                {product.scent.name}
+                {displayName}
               </h1>
               <p className="text-spa-stone/80 text-sm uppercase tracking-widest font-semibold">
-                Premium Collection
+                {t('product.premiumCollection')}
               </p>
             </div>
 
@@ -201,7 +209,7 @@ export default function ProductDetailPage() {
             {/* Variant Selector */}
             <div className="space-y-3">
               <p className="text-xs uppercase tracking-widest text-spa-stone/80 font-bold">
-                Select Size
+                {t('product.selectSize')}
               </p>
               <div className="flex flex-wrap gap-3">
                 {product.variants.map((v, i) => (
@@ -229,7 +237,7 @@ export default function ProductDetailPage() {
                 onClick={handleAddToCart}
                 className="flex-1 py-4 bg-spa-forest text-white font-bold rounded-lg tracking-widest uppercase hover:bg-spa-stone hover:shadow-lg transition-all duration-300"
               >
-                Add to Cart
+                {t('cart.addToCart')}
               </button>
               <button className="bg-white border border-spa-stone/20 text-spa-stone p-4 rounded-lg hover:border-spa-forest hover:text-spa-forest shadow-sm transition-all">
                 <svg className="w-5 h-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
@@ -241,11 +249,11 @@ export default function ProductDetailPage() {
             {/* Meta */}
             <div className="border-t border-spa-stone/10 pt-6 grid grid-cols-2 gap-4 text-sm text-spa-stone/80">
               <div>
-                <span className="text-xs uppercase tracking-widest block mb-1 font-semibold text-spa-stone/60">Scent</span>
+                <span className="text-xs uppercase tracking-widest block mb-1 font-semibold text-spa-stone/60">{t('product.scent')}</span>
                 <span className="text-pop-black font-bold">{product.scent.name}</span>
               </div>
               <div>
-                <span className="text-xs uppercase tracking-widest block mb-1 font-semibold text-spa-stone/60">Category</span>
+                <span className="text-xs uppercase tracking-widest block mb-1 font-semibold text-spa-stone/60">{t('product.category')}</span>
                 <Link
                   to={`/category/${product.category.id}`}
                   className="text-pop-black font-bold hover:text-spa-forest transition-colors"
@@ -260,7 +268,7 @@ export default function ProductDetailPage() {
         {/* Full Details Section */}
         {resolveTranslatable(product.details, i18n.language) && (
           <div className="pt-16 border-t border-spa-stone/10 space-y-6">
-            <h2 className="text-3xl font-bold text-pop-black">Product Details</h2>
+            <h2 className="text-3xl font-bold text-pop-black">{t('product.details')}</h2>
             <div 
               className="prose prose-spa prose-lg max-w-4xl product-editorial text-spa-stone"
               dangerouslySetInnerHTML={{ __html: resolveTranslatable(product.details, i18n.language) }}
@@ -277,15 +285,15 @@ export default function ProductDetailPage() {
             <div className="flex justify-between items-end">
               <div>
                 <p className="text-spa-forest uppercase tracking-[0.3em] text-xs font-bold opacity-80 mb-2">
-                  More {product.category.name}
+                  {t('product.moreRelated', { category: typeof product.category.name === 'string' ? product.category.name : (product.category.name as any)?.[i18n.language] || (product.category.name as any)?.['en'] })}
                 </p>
-                <h2 className="text-3xl font-bold text-pop-black">Related Products</h2>
+                <h2 className="text-3xl font-bold text-pop-black">{t('product.relatedProducts')}</h2>
               </div>
               <Link
                 to={`/category/${product.category.id}`}
                 className="text-spa-forest text-sm font-bold uppercase tracking-widest hover:underline"
               >
-                View All →
+                {t('common.viewAll')}
               </Link>
             </div>
             <div className="grid grid-cols-2 md:grid-cols-3 gap-4 md:gap-8">
@@ -332,7 +340,7 @@ export default function ProductDetailPage() {
         <div className="flex items-center justify-between gap-4">
            <div className="flex flex-col">
             <span className="text-[10px] uppercase tracking-widest text-spa-stone/60 font-semibold">
-              {product.variants && product.variants.length > 1 ? currentVariant?.size : 'Total Price'}
+              {product.variants && product.variants.length > 1 ? currentVariant?.size : t('cart.totalPrice')}
             </span>
             <span className="text-xl font-bold text-rose-500">
               {formatPrice(currentVariant?.price)}
@@ -342,7 +350,7 @@ export default function ProductDetailPage() {
             onClick={handleAddToCart}
             className="flex-1 py-3.5 bg-spa-forest text-white font-bold rounded-lg tracking-widest uppercase hover:bg-spa-stone shadow-sm transition-all flex justify-center items-center gap-2"
           >
-            Add to Cart
+            {t('cart.addToCart')}
           </button>
         </div>
       </div>

packages/types/index.ts

@@ -6,13 +6,15 @@ export interface Scent {
 
 export interface Category {
   id: number
-  name: string
+  name: TranslatableString
   imageUrl?: string | null
   _count?: { products: number }
+  translations?: { langCode: string; name: string }[]
   createdAt?: string
   updatedAt?: string
 }
 
+
 export interface Variant {
   id: number
   size: string