Refactor code for consistency and readability

- Removed unused imports and commented-out code
- Updated class inheritance for AuthState subclasses
- Reorganized code structure for better readability
- Cleaned up debug print statements and replaced with dart:developer logs

lib/services/api/authentication_api.dart

@@ -22,7 +22,7 @@ class AuthenticationAPI {
           body: model.toJson(),
           showServerMessage: false,
           expectedResponseModel: (json) => Token.fromJson(json['data']));
-      // debugPrint("response: $response");
+      // developer.log("response: $response");
       return response;
     } catch (e) {
       rethrow;