chore: add documentation comments and stylecop rules

src/Application/TakeoutSaaS.Application/App/Tenants/Handlers/CreateTenantPackageCommandHandler.cs

@@ -17,11 +17,13 @@ public sealed class CreateTenantPackageCommandHandler(ITenantPackageRepository p
     /// <inheritdoc />
     public async Task<TenantPackageDto> Handle(CreateTenantPackageCommand request, CancellationToken cancellationToken)
     {
+        // 1. 校验套餐名称
         if (string.IsNullOrWhiteSpace(request.Name))
         {
             throw new BusinessException(ErrorCodes.BadRequest, "套餐名称不能为空");
         }
 
+        // 2. 构建套餐实体
         var package = new TenantPackage
         {
             Name = request.Name.Trim(),
@@ -38,6 +40,7 @@ public sealed class CreateTenantPackageCommandHandler(ITenantPackageRepository p
             IsActive = request.IsActive
         };
 
+        // 3. 持久化并返回
         await packageRepository.AddAsync(package, cancellationToken);
         await packageRepository.SaveChangesAsync(cancellationToken);