Update API and WebSocket base URLs to use environment variables for better configuration management

frontend/src/api/request.ts

@@ -2,7 +2,7 @@ import axios from 'axios';
 import { ElMessage } from 'element-plus';
 
 const request = axios.create({
-  baseURL: 'http://localhost:8080',
+  baseURL: import.meta.env.VITE_API_BASE_URL ?? 'http://localhost:8080',
   timeout: 30000,
   headers: {
     'Content-Type': 'application/json'

frontend/src/composables/useWebSocket.ts

@@ -30,7 +30,11 @@ export function useWebSocket(taskId: string | null, onMessage: (msg: ProgressMes
     }
 
     try {
-      const socket = new SockJS('http://localhost:8080/ws');
+      const wsBase =
+        import.meta.env.VITE_WS_BASE_URL !== undefined && import.meta.env.VITE_WS_BASE_URL !== ''
+          ? import.meta.env.VITE_WS_BASE_URL
+          : (typeof window !== 'undefined' ? window.location.origin : 'http://localhost:8080');
+      const socket = new SockJS(`${wsBase}/ws`);
       stompClient = Stomp.over(socket);
       
       // 禁用调试日志