chore: 补充后端核心模块的中文注释

backend/internal/middleware/rabbitmq/likeMQ.go

@@ -17,8 +17,8 @@ const (
 	likeQueue      = "like.events"
 	likeBindingKey = "like.*"
 
-	likeLikeRK   = "like.like"
-	likeUnlikeRK = "like.unlike"
+	likeLikeRK   = "like.like"   // 点赞路由键
+	likeUnlikeRK = "like.unlike" // 取消点赞路由键
 )
 
 type LikeEvent struct {