重构权限检查逻辑

将权限检查逻辑移至 `progName` 不为 null 的条件下，并在此条件下调用 `next()`。调整了对 OPTIONS 请求的处理，确保在权限不足时返回相应的错误信息。

LFlow.UserManagement/UserMiddleware.cs

@@ -44,10 +44,13 @@ namespace LFlow.UserManagement
                     //TODO 从缓存中根据Token获取用户信息，并判断是否有权限
                     await context.Response.WriteAsync(JsonConvert.SerializeObject(ApiResult<object>.FailResult("无权限！", 100501)));
                     var token = context.Request.Cookies["Token"]?.ToString();
-                if(token != null){
+                    if (token != null)
+                    {
                         var user = selfCache.GetAsync<UserModel>(token!);
-                    var userPermissions = service.GetPermissions()
-                }else{
+                        var userPermissions = service?.GetPermissions();
+                    }
+                    else
+                    {
                         await context.Response.WriteAsync(JsonConvert.SerializeObject(ApiResult<object>.FailResult("未登录！", 100500)));
                     }
                 }
@@ -56,7 +59,6 @@ namespace LFlow.UserManagement
             if (context.Request.Method == "OPTIONS")
             {
                 await next();
-            // context.Response.StatusCode = StatusCodes.Status200OK;
             }
         }
     }