Refactor code structure for improved readability and maintainability

Co-authored-by: Copilot <copilot@github.com>

flutter/lib/core/api/api_client.dart

@@ -24,7 +24,7 @@ class ApiClient {
         if (token != null) 'Authorization': 'Bearer $token',
       };
 
-  Future<Map<String, dynamic>> getJson(String path, {String? token}) async {
+  Future<dynamic> getJson(String path, {String? token}) async {
     final response = await _client.get(
       Uri.parse('$baseUrl$path'),
       headers: _headers(token: token),