feat: integrate invite API and improve notification handling

- Add invite code display and binding functionality via API
- Fix notification unread count sync on auth state change
- Improve notification mark read with server state validation
- Add auth state listener to trigger notification refresh
- Add YaoCoinConverter for coin-to-yao type conversion
- Remove YaoLegend from divination screens (UI cleanup)
- Abbreviate relation labels in yao detail view
- Add re-register notice to account delete screen
- Update 'coins' terminology to 'points' in localization
- Fix backend points consumption to only run in CHAT mode
- Add HttpxAuthNoiseFilter to suppress auth endpoint logging
- Fix notification static_schema import path
- Add test coverage for notification bloc error handling
- Update AGENTS.md page header rules and image handling
- Delete deprecated run-dev.sh script

apps/AGENTS.md

@@ -45,6 +45,26 @@ This file governs `apps/**` (Flutter). Keep rules strict, short, and reusable.
 - `AppTheme.light` / `AppTheme.dark` provide complete `ColorScheme` (light + dark). `MaterialApp` wires them via `theme:` / `darkTheme:`.
 - If a semantic slot is missing from `ColorScheme`, add it to `AppTheme` — do not bypass `colorScheme` with hardcoded values.
 
+### Page Header (Must)
+
+All sub-pages (sub-page = any page that is not a home Tab page) `AppBar` must follow:
+
+- **`centerTitle: true`** — title must be horizontally centered; never left-aligned.
+- **`backgroundColor`** and **`surfaceTintColor`** should match the page background to avoid visual seams.
+- Example:
+
+```dart
+appBar: AppBar(
+  title: Text('Notifications'),
+  centerTitle: true,
+  backgroundColor: colors.surfaceContainerLow,
+  surfaceTintColor: colors.surfaceContainerLow,
+  actions: [...],
+),
+```
+
+- When a repeated pattern emerges, extract a reusable component into `shared/widgets/` instead of building `AppBar` independently in each page.
+
 ## Divination Terminology (Must)
 
 - Divination domain terminology must use fixed Chinese terms in code contracts, protocol fields, and UI semantic labels.