修复WebSocket消息接收问题：更新前端订阅路径以匹配后端推送路径

web/src/views/Chat/index.vue

@@ -62,6 +62,8 @@
     <!-- 聊天消息区域 -->
     <main class="chat-main" ref="chatMainRef">
       <div class="messages-container">
+
+
         <div
           v-for="message in chatStore.messages"
           :key="message.id"
@@ -424,13 +426,14 @@
 
   .message-wrapper {
     display: flex;
-    
+    margin-bottom: $spacing-md;
+
     &.user-message {
       justify-content: flex-end;
-      
+
       .message-bubble {
         flex-direction: row-reverse;
-        
+
         .message-content {
           background: $tech-blue;
           color: white;