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/repositories/inventory_repository.dart

@@ -0,0 +1,63 @@
+import 'package:dio/dio.dart';
+import '../core/api/api_client.dart';
+import '../core/exceptions.dart';
+import '../core/models/page_result.dart';
+import '../models/inventory.dart';
+
+class InventoryRepository {
+  final ApiClient _client;
+
+  const InventoryRepository(this._client);
+
+  Future<PageResult<Inventory>> listInventory({
+    int? warehouseId,
+    String? keyword,
+    int page = 1,
+    int pageSize = 50,
+  }) async {
+    try {
+      final params = <String, dynamic>{
+        'page': page,
+        'page_size': pageSize,
+        if (warehouseId != null) 'warehouse_id': warehouseId,
+        if (keyword != null && keyword.isNotEmpty) 'keyword': keyword,
+      };
+      final resp = await _client.get('/inventory', params: params);
+      return PageResult.fromJson(
+        resp.data as Map<String, dynamic>,
+        Inventory.fromJson,
+      );
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '获取库存失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+
+  Future<PageResult<InventoryLog>> listLogs({
+    int? warehouseId,
+    int? productId,
+    int page = 1,
+    int pageSize = 50,
+  }) async {
+    try {
+      final params = <String, dynamic>{
+        'page': page,
+        'page_size': pageSize,
+        if (warehouseId != null) 'warehouse_id': warehouseId,
+        if (productId != null) 'product_id': productId,
+      };
+      final resp = await _client.get('/inventory/logs', params: params);
+      return PageResult.fromJson(
+        resp.data as Map<String, dynamic>,
+        InventoryLog.fromJson,
+      );
+    } on DioException catch (e) {
+      throw AppException(
+        e.response?.data?['error'] as String? ?? '获取流水失败',
+        statusCode: e.response?.statusCode,
+      );
+    }
+  }
+}