feat: Implement dynamic top professionals section with agent/lender tabs using Riverpod for state management.

lib/core/constants/api_constants.dart

@@ -1,6 +1,7 @@
 class ApiConstants {
   ApiConstants._();
 
+  // Auth
   static const String authRegister = '/auth/register';
   static const String authLogin = '/auth/login';
   static const String authForgotPassword = '/auth/forgot-password';
@@ -10,4 +11,8 @@ class ApiConstants {
   static const String authMe = '/auth/me';
   static const String authRefresh = '/auth/refresh';
   static const String authLogout = '/auth/logout';
+
+  // Agents
+  static const String agents = '/agents';
+  static const String agentTypes = '/agent-types';
 }