feat(#173): feed bulles parent branché sur GET /cards

Affiche la file d’attention pastel (assets card_*_h) filtrée
par couple courant, avec accept / refus motivé / ack.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/lib/services/api/api_config.dart

@@ -93,6 +93,10 @@ class ApiConfig {
   static const String conversations = '/conversations';
   static const String notifications = '/notifications';
 
+  /// File d'attention / bulles (#173 / #194).
+  static const String cards = '/cards';
+  static const String cardsStream = '/cards/stream';
+
   // Headers
   static Map<String, String> get headers => {
         'Content-Type': 'application/json',