fix: QQ发送消息时剥离Markdown格式 — 防止**粗体**等标记泄露到聊天

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/platform-bridge/cmd/main.go

@@ -358,6 +358,7 @@ func startQQReaders(router *bridge.PlatformRouter) {
 					var toSend []bridge.ResponseMessage
 					for _, rm := range response.Messages {
 						if rm.Content != "" {
+							rm.Content = qqadapter.ConvertMarkdownToQQ(rm.Content)
 							toSend = append(toSend, rm)
 						}
 					}

backend/platform-bridge/internal/adapter/qq/adapter.go

@@ -378,7 +378,7 @@ func (a *Adapter) ToUnified(rawMessage interface{}) (*bridge.UnifiedMessage, err
 func (a *Adapter) FromUnified(response *bridge.UnifiedResponse) ([]bridge.PlatformMessage, error) {
 	var msgs []bridge.PlatformMessage
 	for _, rm := range response.Messages {
-		content := convertMarkdownToQQ(rm.Content)
+		content := ConvertMarkdownToQQ(rm.Content)
 		runes := []rune(content)
 		if len(runes) > 200 {
 			content = string(runes[:200])
@@ -572,8 +572,8 @@ func extractAttachments(msg *OBv11Message) []bridge.Attachment {
 	return attachments
 }
 
-// convertMarkdownToQQ converts markdown to QQ plain-text format.
-func convertMarkdownToQQ(md string) string {
+// ConvertMarkdownToQQ converts markdown to QQ plain-text format.
+func ConvertMarkdownToQQ(md string) string {
 	md = boldRegex.ReplaceAllString(md, "$1")
 	md = italicRegex.ReplaceAllString(md, "$1")
 	md = strikethroughRegex.ReplaceAllString(md, "$1")