feat(client): 全模块 API 对接 + 修复登陆跳转 + 菜单 UI 优化

API 对接：
- 入库/出库/库存/财务/往来单位/基础数据全部对接后端 REST API
- 新增 repositories、providers、models 层，统一分层架构
- auth 从 flutter_secure_storage 迁移到 shared_preferences

登陆跳转修复：
- 将 _RouterNotifier 提取为独立 Riverpod provider，appRouterProvider
  使用 ref.read 避免依赖链导致 router 重建后跳回 /login
- redirect 函数新增 initialized 守卫，防止 auth 未恢复时误重定向
- 添加调试日志（Router/Auth/ApiClient）定位 401 触发的 logout 链路

退出菜单 UI：
- 去掉 ListTile，改用 Row + 自定义 padding，文字左对齐
- MouseRegion + AnimatedContainer 实现 hover 高亮（普通项蓝底/退出红底）
- 菜单圆角 6px，elevation 8，分割线高度 1px

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

client/lib/providers/warehouse_provider.dart

@@ -0,0 +1,43 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import '../core/api/api_client.dart';
+import '../core/auth/auth_state.dart';
+import '../models/warehouse.dart';
+import '../repositories/warehouse_repository.dart';
+
+final warehouseRepositoryProvider = Provider<WarehouseRepository>((ref) {
+  return WarehouseRepository(ref.watch(apiClientProvider));
+});
+
+final warehouseListProvider =
+    AsyncNotifierProvider<WarehouseListNotifier, List<Warehouse>>(
+  WarehouseListNotifier.new,
+);
+
+class WarehouseListNotifier extends AsyncNotifier<List<Warehouse>> {
+  @override
+  Future<List<Warehouse>> build() {
+    ref.watch(authStateProvider.select((s) => s.user?.shopId));
+    return ref.read(warehouseRepositoryProvider).list();
+  }
+
+  Future<void> reload() async {
+    state = const AsyncValue.loading();
+    state = await AsyncValue.guard(
+        () => ref.read(warehouseRepositoryProvider).list());
+  }
+
+  Future<void> createWarehouse(Map<String, dynamic> data) async {
+    await ref.read(warehouseRepositoryProvider).create(data);
+    await reload();
+  }
+
+  Future<void> updateWarehouse(int id, Map<String, dynamic> data) async {
+    await ref.read(warehouseRepositoryProvider).update(id, data);
+    await reload();
+  }
+
+  Future<void> deleteWarehouse(int id) async {
+    await ref.read(warehouseRepositoryProvider).delete(id);
+    await reload();
+  }
+}