refactor: 更新 Subscribe 函数以收集并返回 RSS 订阅错误信息，增强用户反馈的准确性和可用性

handler/rss/rss.go

@@ -33,6 +33,7 @@ func TestRss(msg model.Message) (reply *model.Reply) {
 func Subscribe(msg model.Message) (reply *model.Reply) {
 	//提取url
 	var subscribedFeeds []string
+	var errs []string
 	for _, data := range msg.StructuredMsg {
 		if data.GetMessageType() == "text" {
 			// 匹配RSS链接：可选协议，域名（包含所有顶级域），路径，不一定以.xml结尾
@@ -41,6 +42,8 @@ func Subscribe(msg model.Message) (reply *model.Reply) {
 				for _, url := range urls {
 					if title, err := SubscribeToFeed(url, msg.UserId, msg.GroupInfo.GroupId); err == nil {
 						subscribedFeeds = append(subscribedFeeds, title)
+					} else {
+						errs = append(errs, err.Error())
 					}
 				}
 			}
@@ -56,7 +59,7 @@ func Subscribe(msg model.Message) (reply *model.Reply) {
 	}
 
 	return &model.Reply{
-		ReplyMsg:       "未找到有效的RSS链接（需要以.xml结尾）",
+		ReplyMsg:       "未找到有效的RSS链接，相关错误信息：\n" + strings.Join(errs, "\n"),
 		ReferOriginMsg: true,
 		FromMsg:        msg,
 	}