feat(admin): 新增管理员角色、账单、订阅、套餐管理功能

- 新增 AdminRolesController 实现角色 CRUD 和权限管理
- 新增 BillingsController 实现账单查询功能
- 新增 SubscriptionsController 实现订阅管理功能
- 新增 TenantPackagesController 实现套餐管理功能
- 新增租户详情、配额使用、账单列表等查询功能
- 新增 TenantPackage、TenantSubscription 等领域实体
- 新增相关枚举：SubscriptionStatus、TenantPackageType 等
- 更新 appsettings 配置文件
- 更新权限授权策略提供者

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/Infrastructure/TakeoutSaaS.Infrastructure/App/Extensions/AppServiceCollectionExtensions.cs

@@ -1,6 +1,7 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using TakeoutSaaS.Application.App.Stores.Services;
+using TakeoutSaaS.Domain.Billings.Repositories;
 using TakeoutSaaS.Domain.Deliveries.Repositories;
 using TakeoutSaaS.Domain.Inventory.Repositories;
 using TakeoutSaaS.Domain.Merchants.Repositories;
@@ -46,6 +47,9 @@ public static class AppServiceCollectionExtensions
         services.AddScoped<IPaymentRepository, EfPaymentRepository>();
         services.AddScoped<IDeliveryRepository, EfDeliveryRepository>();
         services.AddScoped<ITenantRepository, EfTenantRepository>();
+        services.AddScoped<ITenantPackageRepository, EfTenantPackageRepository>();
+        services.AddScoped<ISubscriptionRepository, EfSubscriptionRepository>();
+        services.AddScoped<IBillingRepository, EfBillingRepository>();
         services.AddScoped<IInventoryRepository, EfInventoryRepository>();
         services.AddScoped<IOperationLogRepository, EfOperationLogRepository>();