新增 build:test 方便构建线上的测试环境，优化分享码功能的交互

vite.config.ts

@@ -49,9 +49,16 @@ const plugins = [
   vitePluginCopyRouterEntry(),
 ];
 
+/* ── Deploy base path ── */
+const DEPLOY_ENV = process.env.DEPLOY_ENV || "production";
+const isProd = process.env.NODE_ENV === "production";
+const deployBase = isProd
+  ? (DEPLOY_ENV === "test" ? "/x8/test/modern/" : "/x8/v2/modern/")
+  : "/";
+
 export default defineConfig({
   plugins,
-  base: process.env.NODE_ENV === "production" ? "/x8/v2/modern/" : "/",
+  base: deployBase,
   resolve: {
     alias: {
       "@": path.resolve(import.meta.dirname, "client", "src"),