feat: add Flutter mobile clients and staff delivery API

apps/service_app/test/domain/service_models_test.dart

@@ -0,0 +1,31 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:service_app/domain/models/service_models.dart';
+
+void main() {
+  group('WorkItem', () {
+    test('maps delivery allowed actions from server', () {
+      final item = WorkItem.delivery({
+        'identity': 'order-1',
+        'order_no': 'GAS001',
+        'order_status': 33,
+        'allowed_actions': ['append_tracks', 'arrive', 'exception'],
+      });
+
+      expect(item.identity, 'order-1');
+      expect(item.allowedActions, contains('arrive'));
+      expect(statusName(item.status), '配送中');
+    });
+
+    test('derives ticket actions from server status', () {
+      final item = WorkItem.ticket({
+        'identity': 'ticket-1',
+        'ticket_no': 'TK001',
+        'ticket_status': 11,
+        'category': 'inspection',
+      });
+
+      expect(item.title, '安全检查');
+      expect(item.allowedActions, contains('submit_result'));
+    });
+  });
+}

apps/service_app/test/ui/login_page_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:service_app/app/dependencies.dart';
+import 'package:service_app/data/services/secure_session_store.dart';
+import 'package:service_app/ui/features/auth/login_page.dart';
+
+void main() {
+  testWidgets('staff login explains the single shared entry', (tester) async {
+    final session = StaffSession(SecureSessionStore());
+    await tester.pumpWidget(MaterialApp(home: LoginPage(session: session)));
+
+    expect(find.text('瓶安芯服务工作台'), findsOneWidget);
+    expect(find.text('配送、安装维修与安检共用入口'), findsOneWidget);
+    expect(find.byType(TextField), findsNWidgets(2));
+  });
+}