fix(im): separate SockJS endpoint to /ws/im/sockjs to avoid conflicting with native WebSocket on /ws/im

im-service/src/main/java/com/xuqm/im/config/WebSocketConfig.java

@@ -41,10 +41,10 @@ public class WebSocketConfig implements WebSocketMessageBrokerConfigurer {
     @Override
     public void registerStompEndpoints(StompEndpointRegistry registry) {
         registry.addEndpoint("/ws/im")
+                .setAllowedOriginPatterns("*");
+        registry.addEndpoint("/ws/im/sockjs")
                 .setAllowedOriginPatterns("*")
                 .withSockJS();
-        registry.addEndpoint("/ws/im")
-                .setAllowedOriginPatterns("*");
     }
 
     @Override