fix: move onParse to root and support trailing slash in webhook route

apps/backend/src/index.ts

@@ -29,6 +29,11 @@ const CORS_ORIGIN = process.env.CORS_ORIGIN || "http://localhost:5173";
 const JWT_SECRET = process.env.JWT_SECRET || "homaroma_secret_2026_scent";
 
 const app = new Elysia()
+  .onParse(async ({ request }) => {
+    if (request.url.includes('/api/line/webhook')) {
+      return await request.text();
+    }
+  })
   .use(
     cors({
       origin: [

apps/backend/src/routes/line.ts

@@ -3,13 +3,7 @@ import * as line from '@line/bot-sdk';
 import { lineConfig, lineClient } from '../lib/lineClient';
 import crypto from 'crypto';
 
-export const lineRoutes = new Elysia({ prefix: '/line' })
-  .onParse(async ({ request, contentType }) => {
-    if (contentType?.includes('application/json')) {
-      return await request.text();
-    }
-  })
-  .post('/webhook', async ({ request, body, set }) => {
+const webhookHandler = async ({ request, body, set }: { request: Request, body: any, set: any }) => {
   // 1. Verify Signature
   const signature = request.headers.get('x-line-signature');
   if (!signature) {
@@ -17,7 +11,7 @@ export const lineRoutes = new Elysia({ prefix: '/line' })
     return { error: 'Missing Signature' };
   }
   
-    // In our onParse hook, we intercepted the body and returned it as a raw text string.
+  // In our global onParse hook, we intercepted the body and returned it as a raw text string.
   const rawBody = typeof body === 'string' ? body : JSON.stringify(body);
 
   if (!rawBody) {
@@ -65,4 +59,8 @@ export const lineRoutes = new Elysia({ prefix: '/line' })
     set.status = 500;
     return { error: 'Webhook processing failed' };
   }
-  });
+};
+
+export const lineRoutes = new Elysia({ prefix: '/line' })
+  .post('/webhook', webhookHandler)
+  .post('/webhook/', webhookHandler);