fix: resolve 10 code review issues

High priority:
- Fix concurrent race condition for view_count/like_count (atomic update)
- Add route request ID tracking to prevent race conditions
- Filter get_joke by status=approved (no pending content leak)
- Add error feedback for like button

Performance:
- Optimize random joke query (avoid full table sort)
- Limit page_size max to 100 (DoS prevention)

Medium:
- Add localStorage quota error handling
- Handle empty AI response gracefully
- Fix generate content title extraction

Low:
- Add rejected_jokes to stats API
- Update dashboard to show rejected count

api/app/routers/__init__.py.bak

@@ -0,0 +1,7 @@
+from .jokes import router as jokes_router
+from .categories import router as categories_router
+from .auth import router as auth_router
+from .admin import router as admin_router
+from .settings import router as settings_router
+
+__all__ = ["jokes_router", "categories_router", "auth_router", "admin_router", "settings_router"]