debug: add trace logs to onParse and webhook handler

apps/backend/src/index.ts

@@ -30,8 +30,11 @@ const JWT_SECRET = process.env.JWT_SECRET || "homaroma_secret_2026_scent";
 
 const app = new Elysia()
   .onParse(async ({ request }) => {
+    console.log('[onParse] Incoming request URL:', request.url);
     if (request.url.includes('/api/line/webhook')) {
-      return await request.text();
+      const text = await request.text();
+      console.log('[onParse] Intercepted LINE webhook raw body length:', text.length);
+      return text;
     }
   })
   .use(