Phase 3.1: Remove flutter_bloc + equatable, delete old bloc files

- Remove flutter_bloc and equatable dependencies from both apps
- Delete all 10 old bloc files (5 per app)
- Fix 6 remaining screens that used context.read<ApiClient>() from
  flutter_bloc → converted to ConsumerStatefulWidget/ConsumerWidget
  with ref.read(apiClientProvider)
- Both apps now use Riverpod exclusively for state management

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

client_app/pubspec.yaml

@@ -25,8 +25,6 @@ dependencies:
   web_socket_channel: ^2.4.5
 
   # State management
-  flutter_bloc: ^8.1.5
-  equatable: ^2.0.5
   flutter_riverpod: ^2.6.1
   hooks_riverpod: ^2.6.1
   riverpod_annotation: ^2.6.1