fix: leave setup wizard after completion

frontend/e2e/setup-wizard.e2e.ts

@@ -137,3 +137,69 @@ test('confirms completion after the setup response is interrupted by a service r
   await expect(page.getByText('网络请求失败')).toHaveCount(0);
   await expect(page).toHaveURL(/\/login$/, { timeout: 15_000 });
 });
+
+test('leaves the completed wizard when post-completion status polling is unavailable', async ({ page }) => {
+  let completionStarted = false;
+  await page.route('**/api/v1/setup/**', async (route) => {
+    const request = route.request();
+    const pathname = new URL(request.url()).pathname;
+    if (pathname === '/api/v1/setup/status') {
+      if (completionStarted) {
+        await route.abort('connectionreset');
+        return;
+      }
+      await route.fulfill({
+        json: {
+          data: {
+            required: true,
+            locked: false,
+            ready: false,
+            supportedDatabaseTypes: ['MYSQL'],
+            message: '请完成安装',
+          },
+        },
+      });
+      return;
+    }
+    const body = request.postDataJSON() as Record<string, unknown>;
+    if (pathname.endsWith('/test-connection')) {
+      await route.fulfill({
+        json: {
+          data: {
+            successful: true,
+            databaseType: 'MYSQL',
+            serverVersion: '8.4.6',
+            schemaReady: true,
+            message: 'MySQL 8.4 连接、排序规则和完整迁移权限验证通过',
+          },
+        },
+      });
+      return;
+    }
+    expect(body.adminUsername).toBe('admin');
+    completionStarted = true;
+    await route.fulfill({
+      json: {
+        data: {
+          completed: true,
+          username: 'admin',
+          message: '安装完成，系统正在切换到正式模式',
+          restartAfterSeconds: 1,
+        },
+      },
+    });
+  });
+
+  await page.goto('/setup');
+  await page.getByLabel('数据库密码').fill('fixture-db-password');
+  await page.getByLabel('安装码').fill('fixture-setup-code');
+  await page.getByRole('button', { name: '测试连接' }).click();
+  await page.getByRole('button', { name: '下一步' }).click();
+  await page.getByLabel('管理员密码').fill('SetupAdmin@2026Strong');
+  await page.getByLabel('确认密码').fill('SetupAdmin@2026Strong');
+  await page.getByRole('button', { name: '完成安装' }).click();
+  await page.getByRole('button', { name: '确定', exact: true }).click();
+
+  await expect(page.getByText('安装完成', { exact: true })).toBeVisible();
+  await expect(page).toHaveURL(/\/login$/, { timeout: 5_000 });
+});

frontend/src/pages/setup/index.vue

@@ -378,19 +378,18 @@ function confirmSetup() {
 function startCountdown() {
   window.clearInterval(countdownTimer);
   countdownTimer = window.setInterval(() => {
-    countdown.value -= 1;
-    if (countdown.value <= 0) void openLogin();
+    countdown.value = Math.max(0, countdown.value - 1);
+    if (countdown.value === 0) openLogin();
   }, 1000);
 }
 
-async function openLogin() {
+function openLogin() {
   window.clearInterval(countdownTimer);
-  completionMessage.value = '系统正在启动，请稍候。';
-  if (await waitForSetupCompletion()) {
-    await router.replace('/login');
-    return;
-  }
-  completionMessage.value = '系统启动时间较长，请稍后刷新页面。';
+  countdown.value = 0;
+  completionMessage.value = '正在进入登录页。';
+  // A full navigation clears the setup-mode SPA state retained across the
+  // service restart. The login route guard performs the final setup check.
+  window.location.replace('/login');
 }
 
 onMounted(async () => {