feat: integrate customer service chat functionality and add socket.io-client dependency

- Implemented a customer service chat interface in the application.
- Added socket.io-client for real-time communication.
- Updated language files to include customer service related translations.
- Modified navigation to direct users to the customer service page.
- Enhanced UI elements for better user experience in chat interactions.

pages/index.vue

@@ -179,9 +179,10 @@ export default {
         uni.navigateTo({ url });
     },
     goService() {
-        // Mock service
-        const url = this.$store.state.app.customServiceUrl;
-        if(url) window.open(url, '_blank');
+        // 跳转到客服页面
+        uni.navigateTo({
+          url: '/pages/user/customservice'
+        });
     },
     switchCategory(id) {
         this.currentCategory = id;