refactor: migrate API routes to Hono sub-router

- Create Hono router in api.ts
- Convert 6 API endpoints to Hono format:
  - GET /api/deposit/balance
  - POST /api/deposit/deduct
  - POST /api/test
  - POST /api/chat
  - POST /api/contact
  - GET /api/metrics
- Use Hono CORS middleware for /contact
- Remove manual handleApiRequest and handleContactPreflight
- Integrate with main app via app.route('/api', apiRouter)

Benefits:
- Cleaner declarative routing (44 insertions, 48 deletions)
- Built-in CORS middleware
- Better code organization

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/index.ts

@@ -1,7 +1,7 @@
 import { Env, EmailMessage, ProvisionMessage, MessageBatch } from './types';
 import { sendMessage, setWebhook, getWebhookInfo } from './telegram';
 import { handleWebhook } from './routes/webhook';
-import { handleApiRequest } from './routes/api';
+import { apiRouter } from './routes/api';
 import { handleHealthCheck } from './routes/health';
 import { parseBankSMS } from './services/bank-sms-parser';
 import { matchPendingDeposit } from './services/deposit-matcher';
@@ -69,8 +69,8 @@ app.get('/webhook-info', async (c) => {
   return c.json(result);
 });
 
-// API routes
-app.all('/api/*', (c) => handleApiRequest(c.req.raw, c.env, new URL(c.req.url)));
+// API routes - use Hono router
+app.route('/api', apiRouter);
 
 // Telegram Webhook
 app.post('/webhook', (c) => handleWebhook(c.req.raw, c.env));

src/routes/api.ts

@@ -1,4 +1,6 @@
 import { z } from 'zod';
+import { Hono } from 'hono';
+import { cors } from 'hono/cors';
 import { Env } from '../types';
 import { sendMessage } from '../telegram';
 import {
@@ -762,18 +764,6 @@ async function handleContactForm(request: Request, env: Env): Promise<Response>
   }
 }
 
-/**
- * OPTIONS /api/contact - CORS preflight for contact API
- *
- * @param env - Environment bindings
- * @returns Response with CORS headers
- */
-async function handleContactPreflight(env: Env): Promise<Response> {
-  return new Response(null, {
-    headers: getCorsHeaders(env),
-  });
-}
-
 /**
  * GET /api/metrics - Circuit Breaker 상태 조회 (관리자 전용)
  *
@@ -837,7 +827,7 @@ async function handleMetrics(request: Request, env: Env): Promise<Response> {
 }
 
 /**
- * API 엔드포인트 처리 (라우터)
+ * API Router (Hono)
  *
  * Manual Test:
  * 1. wrangler dev
@@ -867,41 +857,47 @@ async function handleMetrics(request: Request, env: Env): Promise<Response> {
  *    curl http://localhost:8787/api/metrics \
  *      -H "Authorization: Bearer your-webhook-secret"
  */
-export async function handleApiRequest(request: Request, env: Env, url: URL): Promise<Response> {
-  // Deposit API - 잔액 조회 (namecheap-api 전용)
-  if (url.pathname === '/api/deposit/balance' && request.method === 'GET') {
-    return handleDepositBalance(request, env, url);
-  }
+const api = new Hono<{ Bindings: Env }>();
 
-  // Deposit API - 잔액 차감 (namecheap-api 전용)
-  if (url.pathname === '/api/deposit/deduct' && request.method === 'POST') {
-    return handleDepositDeduct(request, env);
-  }
+// CORS middleware for /contact endpoint
+api.use('/contact', cors({
+  origin: (origin, c) => {
+    const allowedOrigin = c.env.HOSTING_SITE_URL || 'https://hosting.anvil.it.com';
+    return origin === allowedOrigin ? origin : null;
+  },
+  allowMethods: ['POST', 'OPTIONS'],
+  allowHeaders: ['Content-Type'],
+}));
 
-  // 테스트 API - 메시지 처리 후 응답 직접 반환
-  if (url.pathname === '/api/test' && request.method === 'POST') {
-    return handleTestApi(request, env);
-  }
+// GET /deposit/balance - 잔액 조회 (namecheap-api 전용)
+api.get('/deposit/balance', async (c) => {
+  const url = new URL(c.req.url);
+  return await handleDepositBalance(c.req.raw, c.env, url);
+});
 
-  // Chat API - 인증된 채팅 API (프로덕션 활성화)
-  if (url.pathname === '/api/chat' && request.method === 'POST') {
-    return handleChatApi(request, env);
-  }
+// POST /deposit/deduct - 잔액 차감 (namecheap-api 전용)
+api.post('/deposit/deduct', async (c) => {
+  return await handleDepositDeduct(c.req.raw, c.env);
+});
 
-  // 문의 폼 API (웹사이트용)
-  if (url.pathname === '/api/contact' && request.method === 'POST') {
-    return handleContactForm(request, env);
-  }
+// POST /test - 테스트 API (개발 환경 전용)
+api.post('/test', async (c) => {
+  return await handleTestApi(c.req.raw, c.env);
+});
 
-  // CORS preflight for contact API
-  if (url.pathname === '/api/contact' && request.method === 'OPTIONS') {
-    return handleContactPreflight(env);
-  }
+// POST /chat - 인증된 채팅 API (프로덕션)
+api.post('/chat', async (c) => {
+  return await handleChatApi(c.req.raw, c.env);
+});
 
-  // Metrics API - Circuit Breaker 상태 조회 (관리자 전용)
-  if (url.pathname === '/api/metrics' && request.method === 'GET') {
-    return handleMetrics(request, env);
-  }
+// POST /contact - 문의 폼 API (웹사이트용)
+api.post('/contact', async (c) => {
+  return await handleContactForm(c.req.raw, c.env);
+});
 
-  return new Response('Not Found', { status: 404 });
-}
+// GET /metrics - Circuit Breaker 상태 조회 (관리자 전용)
+api.get('/metrics', async (c) => {
+  return await handleMetrics(c.req.raw, c.env);
+});
+
+export { api as apiRouter };