feat: Implement messaging functionality with conversation and chat screens, and enhance agent detail views.

lib/core/constants/api_constants.dart

@@ -19,6 +19,16 @@ class ApiConstants {
   // Profile fields
   static const String filterableFields = '/profile-fields/filterable';
 
+  // Testimonials
+  static const String testimonials = '/testimonials';
+
+  // Connection requests
+  static const String connectionRequests = '/connection-requests';
+
   // CMS
   static const String cmsPageLanding = '/cms/page/landing';
+
+  // Messages
+  static const String conversations = '/messages/conversations';
+  static const String unreadCount = '/messages/unread-count';
 }