add start/business unit

lib/features/auth/data/models/business_unit_model.dart

@@ -0,0 +1,91 @@
+/// Business Unit Data Model
+///
+/// Hive model for local storage of business units.
+library;
+
+import 'package:hive_ce/hive.dart';
+import 'package:worker/core/constants/storage_constants.dart';
+import 'package:worker/features/auth/domain/entities/business_unit.dart';
+
+part 'business_unit_model.g.dart';
+
+/// Business Unit Model for Hive storage
+@HiveType(typeId: HiveTypeIds.businessUnitModel)
+class BusinessUnitModel extends HiveObject {
+  /// Unique business unit identifier
+  @HiveField(0)
+  String id;
+
+  /// Business unit code (e.g., "VIKD", "HSKD", "LPKD")
+  @HiveField(1)
+  String code;
+
+  /// Display name
+  @HiveField(2)
+  String name;
+
+  /// Description
+  @HiveField(3)
+  String? description;
+
+  /// Whether this is the default unit
+  @HiveField(4)
+  bool isDefault;
+
+  BusinessUnitModel({
+    required this.id,
+    required this.code,
+    required this.name,
+    this.description,
+    this.isDefault = false,
+  });
+
+  /// Convert to domain entity
+  BusinessUnit toEntity() {
+    return BusinessUnit(
+      id: id,
+      code: code,
+      name: name,
+      description: description,
+      isDefault: isDefault,
+    );
+  }
+
+  /// Create from domain entity
+  factory BusinessUnitModel.fromEntity(BusinessUnit entity) {
+    return BusinessUnitModel(
+      id: entity.id,
+      code: entity.code,
+      name: entity.name,
+      description: entity.description,
+      isDefault: entity.isDefault,
+    );
+  }
+
+  /// Create from JSON
+  factory BusinessUnitModel.fromJson(Map<String, dynamic> json) {
+    return BusinessUnitModel(
+      id: json['id'] as String,
+      code: json['code'] as String,
+      name: json['name'] as String,
+      description: json['description'] as String?,
+      isDefault: json['is_default'] as bool? ?? false,
+    );
+  }
+
+  /// Convert to JSON
+  Map<String, dynamic> toJson() {
+    return {
+      'id': id,
+      'code': code,
+      'name': name,
+      'description': description,
+      'is_default': isDefault,
+    };
+  }
+
+  @override
+  String toString() {
+    return 'BusinessUnitModel(id: $id, code: $code, name: $name)';
+  }
+}