feat: Implement S3 image handling with a new resolver and widget, update agent display, and configure storage base URL.

lib/config/app_config.dart

@@ -13,4 +13,5 @@ class AppConfig {
   }
 
   static String get apiBaseUrl => dotenv.env['API_BASE_URL'] ?? '';
+  static String get storageBaseUrl => dotenv.env['STORAGE_BASE_URL'] ?? '';
 }