chore(mobile): reuse dev-api proxy config for vite preview

mobile-uni/vite.config.ts

@@ -8,19 +8,27 @@ const proxyTarget = process.env.VITE_PROXY_TARGET || 'https://wygj-api.localhost
 // 代理到线上等已带 /dev-api 前缀的网关时，设 VITE_PROXY_KEEP_PREFIX=1 保留前缀
 const keepProxyPrefix = process.env.VITE_PROXY_KEEP_PREFIX === '1';
 
-export default defineConfig({
+const proxy = {
-  plugins: [uni()],
-  server: {
-    host: devHost,
-    port: devPort,
-    strictPort: true,
-    proxy: {
   '/dev-api': {
     target: proxyTarget,
     changeOrigin: true,
     secure: false,
     rewrite: (path) => (keepProxyPrefix ? path : path.replace(/^\/dev-api/, ''))
   }
-    }
+};
+
+export default defineConfig({
+  plugins: [uni()],
+  server: {
+    host: devHost,
+    port: devPort,
+    strictPort: true,
+    proxy
+  },
+  preview: {
+    host: devHost,
+    port: devPort,
+    strictPort: true,
+    proxy
   }
 });