feat:實作通知系統 — 站內通知、Email 通知、Polling 機制

後端
- 新增 6 個 Notification class（預約建立/確認/拒絕/取消/完成、收到評價），database + mail 雙 channel
- 新增 NotificationController（list / unread-count / markRead / markAllRead / destroy）
- 整合通知觸發至 MemberBookingController、ProviderBookingController、CompleteFinishedBookings、ReviewController
- 新增 notifications / jobs / failed_jobs migration
- Docker Compose 加入 queue-worker、mailpit service
- DivingOffer 補上 provider() 關聯

前端
- 新增 notificationStore（Polling 30s/60s 自適應 + Page Visibility API）
- 新增 NotificationBell（未讀 Badge）、NotificationDrawer（側邊通知中心）
- main.js：auth store init 前置於 router.use()，修正 beforeEach guard 時序問題
- notificationAxios：依路徑動態選擇 member/coach token
- NotificationDrawer：改用 new URL().pathname 提取 action_url 路徑

OpenSpec
- 歸檔 notification-system change
- 同步 notification-core / notification-email / notification-triggers specs 至主規格
- 更新 booking-lifecycle / review-lifecycle spec（補充通知觸發 requirement）

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

frontend/src/main.js

@@ -3,8 +3,20 @@ import { createPinia } from 'pinia'
 import './style.css'
 import App from './App.vue'
 import router from './router'
+import { useAuthStore } from './stores/auth'
+import { useCoachAuthStore } from './stores/coachAuth'
+import { useAdminAuthStore } from './stores/adminAuth'
 
 const app = createApp(App)
-app.use(createPinia())
+const pinia = createPinia()
+
+app.use(pinia)
+
+// 在 router 安裝前同步初始化所有 auth store，
+// 確保 beforeEach guard 跑時 isLoggedIn 已反映 localStorage 的實際狀態
+useAuthStore().init()
+useCoachAuthStore().init()
+useAdminAuthStore().init()
+
 app.use(router)
 app.mount('#app')