feat: integrate availability adapter and repository implementation for staff availability management

apps/mobile/packages/domain/lib/krow_domain.dart

@@ -79,6 +79,7 @@ export 'src/entities/home/home_dashboard_data.dart';
 export 'src/entities/home/reorder_item.dart';
 
 // Availability
+export 'src/adapters/availability/availability_adapter.dart';
 export 'src/entities/availability/availability_slot.dart';
 export 'src/entities/availability/day_availability.dart';
 

apps/mobile/packages/domain/lib/src/adapters/availability/availability_adapter.dart

@@ -0,0 +1,33 @@
+import '../../entities/availability/availability_slot.dart';
+
+/// Adapter for [AvailabilitySlot] domain entity.
+class AvailabilityAdapter {
+  static const Map<String, Map<String, String>> _slotDefinitions = {
+    'MORNING': {
+      'id': 'morning',
+      'label': 'Morning',
+      'timeRange': '4:00 AM - 12:00 PM',
+    },
+    'AFTERNOON': {
+      'id': 'afternoon',
+      'label': 'Afternoon',
+      'timeRange': '12:00 PM - 6:00 PM',
+    },
+    'EVENING': {
+      'id': 'evening',
+      'label': 'Evening',
+      'timeRange': '6:00 PM - 12:00 AM',
+    },
+  };
+
+  /// Converts a backend slot name (e.g. 'MORNING') to a Domain [AvailabilitySlot].
+  static AvailabilitySlot fromPrimitive(String slotName, {bool isAvailable = false}) {
+    final def = _slotDefinitions[slotName.toUpperCase()] ?? _slotDefinitions['MORNING']!;
+    return AvailabilitySlot(
+      id: def['id']!,
+      label: def['label']!,
+      timeRange: def['timeRange']!,
+      isAvailable: isAvailable,
+    );
+  }
+}