feat(client): 网络恢复自动刷新 + 离线嗅探 + 连通性感知登录

网络嗅探与自动恢复：
- ConnectivityNotifier：在线时 30s 检测，离线时切换为 1min 嗅探
- 新增 networkRecoveryCountProvider：网络恢复时自增，各数据 provider
  通过 ref.watch 实现自动重新加载
- inventory/product/stock_in/stock_out/partner provider 均已接入

FutureBuilder 类屏幕：
- finance_screen + batch_tracking_screen 通过 ref.listen 监听恢复事件

修复问题 1：API 超时 10s/30s → 5s/15s，减少无网络时等待
修复问题 2：offline banner 文字由"写操作已禁用"改为实际行为描述

连通性感知：
- app 启动时（_AppBootstrap）立即 forceCheck，路由跳转前状态已就绪
- 登录页：watch connectivityProvider，离线时显示警告 banner
- 登录按钮：离线状态下直接提示，不等待超时

测试：
- login_screen_test + login_flow_test 通过 ConnectivityNotifier(skipInit: true)
  覆盖 provider，避免测试环境中 pending HTTP timer

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/test/stock_in_create_submit_flow_test.dart

@@ -0,0 +1,183 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:go_router/go_router.dart';
+import 'package:jiu_client/core/models/page_result.dart';
+import 'package:jiu_client/models/partner.dart';
+import 'package:jiu_client/models/product.dart';
+import 'package:jiu_client/models/stock_in.dart';
+import 'package:jiu_client/models/warehouse.dart';
+import 'package:jiu_client/providers/partner_provider.dart';
+import 'package:jiu_client/providers/product_provider.dart';
+import 'package:jiu_client/providers/stock_in_provider.dart';
+import 'package:jiu_client/providers/warehouse_provider.dart';
+import 'package:jiu_client/screens/stock_in/stock_in_form_screen.dart';
+
+class _FakeWarehouseNotifier extends WarehouseListNotifier {
+  @override
+  Future<List<Warehouse>> build() async {
+    return const [
+      Warehouse(id: 1, name: '主仓库', isDefault: true),
+    ];
+  }
+
+  @override
+  Future<void> reload() async {}
+}
+
+class _FakeSupplierNotifier extends PartnerListNotifier {
+  _FakeSupplierNotifier() : super(type: 'supplier');
+
+  @override
+  Future<PageResult<Partner>> build() async {
+    return const PageResult(
+      data: [
+        Partner(id: 1, name: '张家酒水', type: 'supplier'),
+      ],
+      total: 1,
+      page: 1,
+      pageSize: 20,
+    );
+  }
+
+  @override
+  void reload() {}
+}
+
+class _FakeProductNotifier extends ProductListNotifier {
+  @override
+  Future<PageResult<Product>> build() async {
+    return const PageResult(
+      data: [
+        Product(
+          id: 1,
+          code: 'P001',
+          name: '五粮液',
+          spec: '500ml',
+          unit: '瓶',
+          purchasePrice: 100,
+        ),
+      ],
+      total: 1,
+      page: 1,
+      pageSize: 20,
+    );
+  }
+
+  @override
+  void reload() {}
+
+  @override
+  void setKeyword(String keyword) {}
+
+  @override
+  void setPage(int page) {}
+
+  @override
+  Future<void> createProduct(Map<String, dynamic> data) async {}
+
+  @override
+  Future<void> updateProduct(int id, Map<String, dynamic> data) async {}
+
+  @override
+  Future<void> deleteProduct(int id) async {}
+}
+
+class _CapturingStockInNotifier extends StockInListNotifier {
+  Map<String, dynamic>? capturedData;
+
+  @override
+  Future<PageResult<StockInOrder>> build() async {
+    return const PageResult(data: [], total: 0, page: 1, pageSize: 20);
+  }
+
+  @override
+  void reload() {}
+
+  @override
+  void setPage(int page) {}
+
+  @override
+  void setStatus(String status) {}
+
+  @override
+  void setDateRange(String? startDate, String? endDate) {}
+
+  @override
+  Future<void> createOrder(Map<String, dynamic> data) async {
+    capturedData = data;
+  }
+
+  @override
+  Future<void> submitOrder(int id) async {}
+
+  @override
+  Future<void> approveOrder(int id) async {}
+
+  @override
+  Future<void> rejectOrder(int id) async {}
+}
+
+void main() {
+  testWidgets('stock-in form creates and submits a pending order',
+      (tester) async {
+    tester.view.physicalSize = const Size(1440, 1200);
+    tester.view.devicePixelRatio = 1.0;
+    addTearDown(tester.view.resetPhysicalSize);
+
+    final stockInNotifier = _CapturingStockInNotifier();
+    final router = GoRouter(
+      initialLocation: '/stock-in/new',
+      routes: [
+        GoRoute(
+          path: '/stock-in',
+          builder: (_, __) => const Scaffold(body: Text('stock-in list')),
+        ),
+        GoRoute(
+          path: '/stock-in/new',
+          builder: (_, __) => const StockInFormScreen(),
+        ),
+      ],
+    );
+
+    await tester.pumpWidget(
+      ProviderScope(
+        overrides: [
+          warehouseListProvider.overrideWith(() => _FakeWarehouseNotifier()),
+          supplierListProvider.overrideWith(() => _FakeSupplierNotifier()),
+          productListProvider.overrideWith(() => _FakeProductNotifier()),
+          stockInListProvider.overrideWith(() => stockInNotifier),
+        ],
+        child: MaterialApp.router(routerConfig: router),
+      ),
+    );
+    await tester.pumpAndSettle();
+
+    await tester.tap(find.byType(DropdownButtonFormField<int>).at(0));
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('主仓库').last);
+    await tester.pumpAndSettle();
+
+    await tester.tap(find.byType(DropdownButtonFormField<int>).at(2));
+    await tester.pumpAndSettle();
+    await tester.tap(find.text('五粮液（500ml）').last);
+    await tester.pumpAndSettle();
+
+    await tester.enterText(find.byType(TextFormField).at(1), '10');
+    await tester.enterText(find.byType(TextFormField).at(2), '100');
+
+    await tester.tap(find.text('提交审核'));
+    await tester.pump();
+    await tester.pumpAndSettle();
+
+    expect(find.text('stock-in list'), findsOneWidget);
+    expect(stockInNotifier.capturedData, isNotNull);
+    expect(stockInNotifier.capturedData!['warehouse_id'], 1);
+    expect(stockInNotifier.capturedData!['status'], 'pending');
+    expect((stockInNotifier.capturedData!['items'] as List).length, 1);
+    expect(
+      (stockInNotifier.capturedData!['items'] as List).first['product_id'],
+      1,
+    );
+  });
+}