feat: customer page

lib/domain/customer/customer.dart

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+import 'package:dartz/dartz.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+import '../../common/api/api_failure.dart';
+
+part 'customer.freezed.dart';
+part 'entities/customer_entity.dart';
+part 'failures/customer_failure.dart';
+part 'repositories/i_customer_repository.dart';

lib/domain/customer/entities/customer_entity.dart

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+part of '../customer.dart';
+
+@freezed
+class Customer with _$Customer {
+  const factory Customer({
+    required String id,
+    required String organizationId,
+    required String name,
+    required String email,
+    required String phone,
+    required String address,
+    required bool isDefault,
+    required bool isActive,
+    required Map<String, dynamic> metadata,
+    required String createdAt,
+    required String updatedAt,
+  }) = _Customer;
+
+  factory Customer.empty() => Customer(
+    id: '',
+    organizationId: '',
+    name: '',
+    email: '',
+    phone: '',
+    address: '',
+    isDefault: false,
+    isActive: false,
+    metadata: const {},
+    createdAt: '',
+    updatedAt: '',
+  );
+}

lib/domain/customer/failures/customer_failure.dart

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+part of '../customer.dart';
+
+@freezed
+sealed class CustomerFailure with _$CustomerFailure {
+  const factory CustomerFailure.serverError(ApiFailure failure) = _ServerError;
+  const factory CustomerFailure.unexpectedError() = _UnexpectedError;
+  const factory CustomerFailure.empty() = _Empty;
+  const factory CustomerFailure.dynamicErrorMessage(String erroMessage) =
+      _DynamicErrorMessage;
+}

lib/domain/customer/repositories/i_customer_repository.dart

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+part of '../customer.dart';
+
+abstract class ICustomerRepository {
+  Future<Either<CustomerFailure, List<Customer>>> get({
+    int page = 1,
+    int limit = 20,
+    String? search,
+  });
+}