feat: Refactor code structure and optimize performance across multiple modules

mobile-apps/staff-app/lib/features/profile/certificates/data/models/certificate_model.dart

@@ -0,0 +1,24 @@
+class CertificateModel {
+  final String id;
+  final String name;
+
+
+  CertificateModel({
+    required this.id,
+    required this.name,
+  });
+
+  factory CertificateModel.fromJson(Map<String, dynamic> json) {
+    return CertificateModel(
+      id: json['id'],
+      name: json['name'],
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'name': name,
+    };
+  }
+}

mobile-apps/staff-app/lib/features/profile/certificates/data/models/certificates_repository_impl.dart

@@ -0,0 +1,34 @@
+import 'package:injectable/injectable.dart';
+import 'package:krow/features/profile/certificates/data/certificates_api_provider.dart';
+import 'package:krow/features/profile/certificates/domain/certificates_repository.dart';
+import 'package:krow/features/profile/certificates/data/models/certificate_model.dart';
+import 'package:krow/features/profile/certificates/data/models/staff_certificate.dart';
+
+@Injectable(as: CertificatesRepository)
+class CertificatesRepositoryImpl extends CertificatesRepository {
+  final CertificatesApiProvider _certificatesApiProvider;
+
+  CertificatesRepositoryImpl(this._certificatesApiProvider);
+
+  @override
+  Future<List<CertificateModel>> getCertificates() async {
+    return _certificatesApiProvider.fetchCertificates();
+  }
+
+  @override
+  Future<StaffCertificate> putStaffCertificate(
+      String certificateId, String imagePath, String certificateDate) {
+    return _certificatesApiProvider.putStaffCertificate(
+        certificateId, imagePath, certificateDate);
+  }
+
+  @override
+  Future<List<StaffCertificate>> getStaffCertificates() async{
+    return (await _certificatesApiProvider.fetchStaffCertificates()).edges.map((e) => e.node).toList();
+  }
+
+  @override
+  Future<void> deleteStaffCertificate(String certificateId) {
+    return _certificatesApiProvider.deleteStaffCertificate(certificateId);
+  }
+}

mobile-apps/staff-app/lib/features/profile/certificates/data/models/staff_certificate.dart

@@ -0,0 +1,32 @@
+import 'package:json_annotation/json_annotation.dart';
+import 'package:krow/features/profile/certificates/data/models/certificate_model.dart';
+
+part 'staff_certificate.g.dart';
+
+enum CertificateStatus {
+  verified,
+  pending,
+  declined,
+}
+
+@JsonSerializable(fieldRename: FieldRename.snake)
+class StaffCertificate {
+  final String id;
+  CertificateModel certificate;
+  final String expirationDate;
+  final CertificateStatus status;
+  final String file;
+
+  StaffCertificate(
+      {required this.id,
+      required this.certificate,
+      required this.expirationDate,
+      required this.status,
+      required this.file});
+
+  factory StaffCertificate.fromJson(Map<String, dynamic> json) {
+    return _$StaffCertificateFromJson(json);
+  }
+
+  Map<String, dynamic> toJson() => _$StaffCertificateToJson(this);
+}