feat(tkuser): 알림 시스템 이관 system1-factory → tkuser

- Phase 1: tkuser에 알림 CRUD, Push/ntfy 발송, 내부 알림 API 추가
- Phase 2: notifyHelper URL을 tkuser-api:3000으로 전환 (system2, tkpurchase, tksafety, system1)
- Phase 3: notification-bell.js API 도메인 tkuser로 변경 + 캐시 버스팅 v=4
- Phase 4: system1에서 알림 코드 제거 (routes, controllers, models, utils)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

user-management/api/index.js

@@ -21,6 +21,8 @@ const partnerRoutes = require('./routes/partnerRoutes');
 const vendorRoutes = require('./routes/vendorRoutes');
 const consumableItemRoutes = require('./routes/consumableItemRoutes');
 const notificationRecipientRoutes = require('./routes/notificationRecipientRoutes');
+const notificationRoutes = require('./routes/notificationRoutes');
+const pushSubscriptionRoutes = require('./routes/pushSubscriptionRoutes');
 
 const app = express();
 const PORT = process.env.PORT || 3000;
@@ -31,6 +33,8 @@ const allowedOrigins = [
   'https://tkqc.technicalkorea.net',
   'https://tkuser.technicalkorea.net',
   'https://tkpurchase.technicalkorea.net',
+  'https://tksafety.technicalkorea.net',
+  'https://tksupport.technicalkorea.net',
 ];
 if (process.env.NODE_ENV === 'development') {
   allowedOrigins.push('http://localhost:30080', 'http://localhost:30180', 'http://localhost:30280');
@@ -64,6 +68,8 @@ app.use('/api/partners', partnerRoutes);
 app.use('/api/vendors', vendorRoutes);
 app.use('/api/consumable-items', consumableItemRoutes);
 app.use('/api/notification-recipients', notificationRecipientRoutes);
+app.use('/api/notifications', notificationRoutes);
+app.use('/api/push', pushSubscriptionRoutes);
 
 // 404
 app.use((req, res) => {
@@ -83,4 +89,21 @@ app.listen(PORT, () => {
   console.log(`tkuser-api running on port ${PORT}`);
 });
 
+// 오래된 알림 정리 cron (매일 03:00 KST)
+(function scheduleNotificationCleanup() {
+  const notificationModel = require('./models/notificationModel');
+  function runCleanup() {
+    const now = new Date();
+    const kstHour = (now.getUTCHours() + 9) % 24;
+    if (kstHour === 3 && now.getMinutes() < 1) {
+      notificationModel.deleteOld(30).then(count => {
+        if (count > 0) console.log(`오래된 알림 ${count}건 정리 완료`);
+      }).catch(err => {
+        console.error('알림 정리 실패:', err.message);
+      });
+    }
+  }
+  setInterval(runCleanup, 60000);
+})();
+
 module.exports = app;