feat: Implement agent network management and refactor app navigation with a new AppShell component.

lib/features/agents/data/agents_repository.dart

@@ -195,6 +195,33 @@ class AgentsRepository {
     }
   }
 
+  /// Get received connection requests: GET /connection-requests/received?status=...
+  Future<List<Map<String, dynamic>>> getReceivedRequests(String status) async {
+    try {
+      final response = await _dio.get(
+        '${ApiConstants.connectionRequests}/received',
+        queryParameters: {'status': status},
+      );
+      final data = response.data['data'] as List<dynamic>? ?? [];
+      return data.cast<Map<String, dynamic>>();
+    } on DioException catch (_) {
+      return [];
+    }
+  }
+
+  /// Respond to connection request: PATCH /connection-requests/{id}/respond
+  Future<bool> respondToRequest(String requestId, String status) async {
+    try {
+      await _dio.patch(
+        '${ApiConstants.connectionRequests}/$requestId/respond',
+        data: {'status': status},
+      );
+      return true;
+    } on DioException catch (_) {
+      return false;
+    }
+  }
+
   /// Get agent types: GET /agent-types
   /// Response: { success, data: [...] }
   Future<List<AgentType>> getAgentTypes() async {