docs: tambah tugas Push Notification Microservice (VAPID + FastAPI) ke backlog

backlog.md

@@ -77,6 +77,74 @@ Open → In Progress → Pending (menunggu user/pihak lain) → Resolved → Clo
 - [ ] GET /ticket_articles/:ticket_id (log/komentar)
 - [ ] POST /ticket_articles (tambah komentar/update)
 
+---
+# Push Notification Microservice
+
+## Arsitektur yang Disarankan: **Web Push (VAPID) + ntfy / Superstream**
+
+### Opsi Backend
+| Platform | Protokol | Docker | PWA Support | LDAP | Nilai |
+|---|---|---|---|---|---|
+| **ntfy** | HTTP Push + WebSocket | ✅ | ✅ (Web Push) | via proxy | 🥇 Ringan & simpel |
+| **Webpush custom (FastAPI)** | Web Push VAPID | ✅ | ✅ | ✅ native | 🥈 Full kontrol |
+| **Firebase FCM** | FCM | ❌ self-host | ✅ | ❌ | ❌ vendor lock-in |
+| **Apprise** | Multi-channel | ✅ | ❌ | ❌ | Sebagai relay saja |
+
+### **Rekomendasi: Custom FastAPI Push Service + Web Push VAPID**
+- Self-hosted, no vendor lock-in
+- Compatible Web Push API — bekerja di browser (Chrome, Firefox, Edge, Safari iOS 16.4+)
+- PWA: Service Worker `push` event sudah didukung `@ducanh2912/next-pwa`
+- Subscription per-user (LDAP username) disimpan di DB
+- Trigger dari Zammad webhook, Collector alert, atau manual
+
+### Alur Push Notification
+```
+Event (Zammad tiket baru / Asset alert / dll)
+    │
+    ▼
+Push Service API (FastAPI, port 17000)
+    │
+    ├─ Lookup subscription by user/group LDAP
+    ├─ Web Push VAPID → Browser/PWA Service Worker
+    └─ (opsional) relay ke ntfy/email/webhook
+         │
+         ▼
+    Browser / PWA
+    Service Worker `push` event
+         │
+         ▼
+    Notification (judul, body, icon, action button, url)
+```
+
+## Setup Push Service
+- [ ] Buat `geonet-push` service (FastAPI + pywebpush)
+- [ ] Generate VAPID key pair (public/private)
+- [ ] Endpoint: `POST /subscribe` — simpan push subscription per user LDAP
+- [ ] Endpoint: `POST /unsubscribe` — hapus subscription
+- [ ] Endpoint: `POST /send` — kirim notif ke user/group (internal, pakai API key)
+- [ ] Docker Compose di 10.100.1.24, domain: `push.gisportal.id` (internal)
+- [ ] Simpan subscription di PostgreSQL/SQLite
+
+## Sumber Event (Trigger)
+- [ ] **Zammad webhook** → tiket baru, update status, assign ke user/group
+- [ ] **Collector / Asset Management** → device offline, disk penuh, alert threshold
+- [ ] **Manual broadcast** → pengumuman IT Admin ke semua user atau group tertentu
+- [ ] *(Future)* Monitoring alert (Zabbix webhook → push service)
+
+## FE Integration (Next.js PWA)
+- [ ] `src/lib/push-client.ts` — subscribe/unsubscribe, kirim VAPID public key ke browser
+- [ ] Service Worker handler `push` event (via `@ducanh2912/next-pwa` custom SW)
+- [ ] Permission request UI — tombol "Aktifkan Notifikasi" di halaman profile/settings
+- [ ] Notification payload: `{ title, body, icon, badge, url, tag }`
+- [ ] Action button pada notif: "Lihat Tiket", "Lihat Asset"
+- [ ] Notif center di navbar — in-app list notifikasi (polling atau WebSocket)
+
+## Kategori Notifikasi
+- 🎫 **Ticketing**: tiket baru assigned, update status, komentar baru, SLA overdue
+- 🖥️ **Asset Management**: device offline > X menit, disk usage > 90%, tiket asset baru
+- 📢 **Broadcast IT**: pengumuman, maintenance, downtime
+- *(Future)* 📊 Monitoring: alert Zabbix
+
 ---
 # FE