chore: 补充后端核心模块的中文注释

backend/internal/middleware/rabbitmq/dlx.go

@@ -23,7 +23,7 @@ func DeclareDLX(ch *amqp.Channel, queueName string) error {
 	}
 	dlxQueue := queueName + ".dlx"
 	_, err := ch.QueueDeclare(
-		dlxQueue, true, false, false, false, nil,
+		dlxQueue, true, false, false, false, nil, // 死信队列不设置 DLX
 	)
 	if err != nil {
 		return err

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 {

backend/internal/middleware/rabbitmq/rabbitMQ.go

@@ -69,12 +69,12 @@ func DeclareTopic(ch *amqp.Channel, exchange string, queue string, bindingKey st
 	}
 
 	q, err := ch.QueueDeclare(
-		queue,
-		true,
-		false,
-		false,
-		false,
-		amqp.Table{"x-dead-letter-exchange": DLXExchange},
+		queue, // 队列名称
+		true,  // 持久化
+		false, // autoDelete 是否在未使用时自动删除
+		false, // exclusive 是否排他（允许多个消费者共享）
+		false, // noWait 是否不等待 broker 确认
+		amqp.Table{"x-dead-letter-exchange": DLXExchange}, // 死信交换机
 	)
 	if err != nil {
 		return err
@@ -84,8 +84,8 @@ func DeclareTopic(ch *amqp.Channel, exchange string, queue string, bindingKey st
 		q.Name,
 		bindingKey,
 		exchange,
-		false,
-		nil,
+		false, // noWait
+		nil,   // args
 	); err != nil {
 		return err
 	}
@@ -107,10 +107,10 @@ func PublishJSON(ctx context.Context, ch *amqp.Channel, exchange string, routing
 		return err
 	}
 	return ch.PublishWithContext(ctx, exchange, routingKey, false, false, amqp.Publishing{
-		ContentType:  "application/json",
-		DeliveryMode: amqp.Persistent,
-		Timestamp:    time.Now(),
-		Body:         b,
+		ContentType:  "application/json", // 消息格式
+		DeliveryMode: amqp.Persistent,    // 消息持久化到磁盘, 值为 1 则不持久化, 值为 2 则持久化, amqp.Presistent 为 2
+		Timestamp:    time.Now(),         // 消息产生的时间戳
+		Body:         b,                  // 实际消息内容(JSON字节)
 	})
 }