feat(client/notices): 通知页真实化+铃铛红点接 provider+进页清读+三类型标签六语

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01P9G7E3wmAYL9KeYCVZVsqu

client/lib/screens/account_page.dart

@@ -9,6 +9,7 @@ import '../state/account_providers.dart';
 import '../state/app_providers.dart';
 import '../state/auth_provider.dart';
 import '../state/navigation_provider.dart';
+import '../state/notices_provider.dart';
 import '../widgets/account_screens.dart';
 import '../widgets/app_top_bar.dart';
 import '../widgets/notification_bell.dart';
@@ -136,7 +137,7 @@ class AccountPage extends ConsumerWidget {
       AppTopBar(
         brand: t.brand,
         trailing: NotificationBell(
-          hasUnread: true,
+          hasUnread: (ref.watch(noticesProvider).valueOrNull?.unreadCount ?? 0) > 0,
           onTap: () => open(NavView.notifications, NotificationsScreen(t: t)),
         ),
       ),