release: squash merge develop → master

Quotidien / Epic C : feed bulles parent (#173), module Cartes (#194/#195),
evenements_agenda (#205), couples garde AM (#169–#171), API absences (#172).

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

frontend/lib/services/api/cards_stream_connector_stub.dart

@@ -0,0 +1,13 @@
+import 'dart:async';
+
+/// Connecteur SSE — stub (tests / plateformes sans impl).
+class CardsStreamConnector {
+  Future<void> connect({
+    required String url,
+    String? bearerToken,
+    required void Function(String eventType, String data) onEvent,
+    required void Function(Object error) onError,
+  }) async {}
+
+  void close() {}
+}