feat: 站内通知

openspec/changes/add-personal-notifications/tasks.md

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+## 1. API and Data Contract
+
+- [x] 1.1 Define the client-side personal notification item and paginated list contract
+- [x] 1.2 Define the client-side unread count and read-operation contracts
+- [x] 1.3 Add authenticated notification API wrappers
+
+## 2. Notification Behavior
+
+- [ ] 2.1 Return only current customer's visible, unexpired business notifications
+- [ ] 2.2 Apply creation-time and notification-ID descending ordering
+- [ ] 2.3 Support idempotent single-read and read-all operations
+- [ ] 2.4 Exclude platform sync and system operations notifications from unread count
+
+## 3. Client Entry
+
+- [x] 3.1 Add the personal notification list entry and pagination handling
+- [x] 3.2 Add unread-count display and refresh behavior
+- [x] 3.3 Mark notifications read from list actions and support mark-all-read
+
+## 4. Verification
+
+- [ ] 4.1 Test authentication, pagination limits, ordering, and visibility isolation
+- [ ] 4.2 Test idempotent read behavior and unread-count updates
+- [x] 4.3 Verify the H5 build and unified success/error response handling
+
+> Note: The repository contains the H5 client only. Tasks 2.1-2.4 and 4.1-4.2 require implementation and verification in the backend service repository.