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';
 
+const 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: {
-      '/dev-api': {
-        target: proxyTarget,
-        changeOrigin: true,
-        secure: false,
-        rewrite: (path) => (keepProxyPrefix ? path : path.replace(/^\/dev-api/, ''))
-      }
-    }
+    proxy
+  },
+  preview: {
+    host: devHost,
+    port: devPort,
+    strictPort: true,
+    proxy
   }
 });