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(

apps/backend/src/routes/line.ts

@@ -4,6 +4,9 @@ import { lineConfig, lineClient } from '../lib/lineClient';
 import crypto from 'crypto';
 
 const webhookHandler = async ({ request, body, set }: { request: Request, body: any, set: any }) => {
+  console.log('[LINE Webhook] Handler body type:', typeof body);
+  console.log('[LINE Webhook] Channel Secret configured:', !!lineConfig.channelSecret, lineConfig.channelSecret ? lineConfig.channelSecret.substring(0, 4) + '...' : 'NONE');
+
   // 1. Verify Signature
   const signature = request.headers.get('x-line-signature');
   if (!signature) {