refactor(mq): 拆分交换器并新增brotherSend方法

- 新增 AI_CHAT_EXCHANGE_NAME、BIG_BROTHER_EXCHANGE_NAME 两个HeadersExchange
- MQSender 新增 brotherSend 方法，支持按 tenantId 路由到大佬队列
- ServerBigBrotherServiceImpl 在保存/更新后，若 Redis 标记存在则异步发送消息
- 移除 HostInfoServiceImpl 多余空行，保持代码整洁

src/main/java/com/yupi/springbootinit/config/RabbitMQConfig.java

@@ -22,6 +22,9 @@ public class RabbitMQConfig {
 
     public static final String EXCHANGE_NAME = "user.headers.exchange";
 
+    public static final String AI_CHAT_EXCHANGE_NAME = "ai.chat.headers.exchange";
+    public static final String BIG_BROTHER_EXCHANGE_NAME = "big.brother.headers.exchange";
+
     //创建队列
     //true:表示持久化
     //队列在默认情况下放到内存，rabbitmq重启后就丢失了，如果希望重启后，队列
@@ -46,6 +49,21 @@ public class RabbitMQConfig {
                 .build();
     }
 
+    @Bean
+    public HeadersExchange aiChatHeadersExchange() {
+        return ExchangeBuilder.headersExchange(AI_CHAT_EXCHANGE_NAME)
+                .durable(true)
+                .build();
+    }
+
+    @Bean
+    public HeadersExchange bigBrotherHeadersExchange() {
+        return ExchangeBuilder.headersExchange(BIG_BROTHER_EXCHANGE_NAME)
+                .durable(true)
+                .build();
+    }
+
+
     @Bean
     public RabbitAdmin rabbitAdmin(ConnectionFactory cf) {
         return new RabbitAdmin(cf);