fix(chat): 修复一键清理未读失败

backend/internal/modules/chat/handler_admin.go

@@ -82,6 +82,19 @@ func (h *Handler) AdminMarkRead(c *gin.Context) {
 	h.markRead(c, Principal{Type: "admin", ID: adminID})
 }
 
+func (h *Handler) AdminMarkAllRead(c *gin.Context) {
+	adminID, ok := currentAdminID(c)
+	if !ok {
+		response.Unauthorized(c, "缺少管理员上下文")
+		return
+	}
+	if err := h.service.MarkAllAdminConversationsRead(c.Request.Context(), adminID); err != nil {
+		writeChatError(c, err)
+		return
+	}
+	response.OK(c, gin.H{"read": true})
+}
+
 func (h *Handler) AdminTransfer(c *gin.Context) {
 	adminID, ok := currentAdminID(c)
 	if !ok {