直播：status 返回观看人数，后台开播页轮询展示

Made-with: Cursor

server/pkg/weblive/ws.go

@@ -45,8 +45,9 @@ func handleLiveStatus(c *gin.Context) {
 	}
 	h.mu.RLock()
 	live := h.publishConn != nil && h.pubPC != nil && len(h.forwarders) > 0
+	viewers := len(h.viewers)
 	h.mu.RUnlock()
-	c.JSON(http.StatusOK, gin.H{"live": live})
+	c.JSON(http.StatusOK, gin.H{"live": live, "viewers": viewers})
 }
 
 func handleLiveWS(c *gin.Context) {