feat: 更新 API 前缀配置，调整 Vite 代理设置以匹配新环境

frontend/.env.example

@@ -1,3 +1,2 @@
 VITE_API_PREFIX=/app_03/api
 VITE_UPLOADS_PREFIX=/uploads
-

frontend/src/app/services/api.ts

@@ -2,7 +2,8 @@ const TOKEN_KEY = "auth_token";
 
 const env = (import.meta as any).env || {};
 const API_PREFIX: string = (env.VITE_API_PREFIX as string) || "/api";
-const APP_BASE_URL: string = (env.BASE_URL as string) || "/";
+// APP_BASE_URL = basename = 从 API_PREFIX 提取（"/app_03/api" → "/app_03"）
+const APP_BASE_URL: string = API_PREFIX.replace(/\/api\/?$/, '') || '/';
 
 function joinPrefix(prefix: string, path: string) {
   const p = prefix.endsWith("/") ? prefix.slice(0, -1) : prefix;

frontend/vite.config.ts

@@ -33,11 +33,12 @@ export default defineConfig(({ mode }) => {
       allowedHosts: ['.trycloudflare.com', '.loca.lt'],
       proxy: {
         [apiPrefix]: {
-          target: 'http://localhost:8000',
+          target: 'http://localhost:8030',
           changeOrigin: true,
+          rewrite: (path) => path.replace(/^\/app_03\/api/, '/api'),
         },
         [uploadsPrefix]: {
-          target: 'http://localhost:8000',
+          target: 'http://localhost:8030',
           changeOrigin: true,
         },
       },