feat: implement error handling and validation middleware, enhance result handling

Co-authored-by: Copilot <copilot@github.com>

apps/backend/src/app.ts

@@ -3,10 +3,15 @@ import type { AppEnv } from '@/types/hono';
 import { Hono } from 'hono';
 import { cors } from 'hono/cors';
 import { requestId } from 'hono/request-id';
+import { errorHandler } from './lib/http/error-handler';
+import { requestIdMiddleware } from './lib/http/request-id';
 
 export function createApp() {
   const app = new Hono<AppEnv>();
 
+  app.use('*', requestIdMiddleware)
+  app.use('*', errorHandler)
+
   const allowedOrigins = (Bun.env.CORS_ORIGIN ?? 'http://localhost:5173,http://127.0.0.1:5173')
     .split(',')
     .map((value) => value.trim())