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

apps/backend/prisma/schema.prisma

@@ -18,12 +18,25 @@ model Scent {
 }
 
 model Category {
-  id        Int       @id @default(autoincrement())
-  name      String    @unique
-  imageUrl  String?
-  products  Product[]
-  createdAt DateTime  @default(now())
-  updatedAt DateTime  @updatedAt
+  id           Int                   @id @default(autoincrement())
+  name         String                @unique
+  imageUrl     String?
+  products     Product[]
+  translations CategoryTranslation[]
+  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 {