chore: add documentation comments and stylecop rules

src/Application/TakeoutSaaS.Application/Identity/Handlers/CreatePermissionCommandHandler.cs

@@ -17,7 +17,10 @@ public sealed class CreatePermissionCommandHandler(
 {
     public async Task<PermissionDto> Handle(CreatePermissionCommand request, CancellationToken cancellationToken)
     {
+        // 1. 获取租户上下文
         var tenantId = tenantProvider.GetCurrentTenantId();
+
+        // 2. 构建权限实体
         var permission = new Permission
         {
             TenantId = tenantId,
@@ -26,9 +29,11 @@ public sealed class CreatePermissionCommandHandler(
             Description = request.Description
         };
 
+        // 3. 持久化
         await permissionRepository.AddAsync(permission, cancellationToken);
         await permissionRepository.SaveChangesAsync(cancellationToken);
 
+        // 4. 返回 DTO
         return new PermissionDto
         {
             Id = permission.Id,