fix: harden first-run database setup

frontend/e2e/setup-wizard.e2e.ts

@@ -11,6 +11,7 @@ test('first-run wizard tests MySQL, creates the administrator and stays responsi
           data: {
             required: !completed,
             locked: completed,
+            ready: completed,
             supportedDatabaseTypes: ['MYSQL'],
             message: completed ? '系统已完成安装' : '请完成安装',
           },
@@ -30,7 +31,7 @@ test('first-run wizard tests MySQL, creates the administrator and stays responsi
             databaseType: 'MYSQL',
             serverVersion: '8.4.6',
             schemaReady: true,
-            message: 'MySQL 8.4 连接和 DDL/DML 权限验证通过',
+            message: 'MySQL 8.4 连接和完整迁移权限验证通过',
           },
         },
       });
@@ -58,7 +59,7 @@ test('first-run wizard tests MySQL, creates the administrator and stays responsi
   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 expect(page.getByText('MySQL 8.4 连接和 DDL/DML 权限验证通过')).toBeVisible();
+  await expect(page.getByText('MySQL 8.4 连接和完整迁移权限验证通过')).toBeVisible();
   await page.getByRole('button', { name: '下一步' }).click();
 
   await page.getByLabel('管理员密码').fill('SetupAdmin@2026Strong');
@@ -74,3 +75,61 @@ test('first-run wizard tests MySQL, creates the administrator and stays responsi
   }));
   expect(layout.scrollWidth).toBeLessThanOrEqual(layout.clientWidth);
 });
+
+test('confirms completion after the setup response is interrupted by a service restart', async ({ page }) => {
+  let completionStarted = false;
+  let recoveryChecks = 0;
+  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) recoveryChecks += 1;
+      const ready = completionStarted && recoveryChecks >= 2;
+      await route.fulfill({
+        json: {
+          data: {
+            required: !completionStarted,
+            locked: completionStarted,
+            ready,
+            supportedDatabaseTypes: ['MYSQL'],
+            message: ready ? '系统已完成安装' : '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 连接和完整迁移权限验证通过',
+          },
+        },
+      });
+      return;
+    }
+    expect(body.adminUsername).toBe('admin');
+    completionStarted = true;
+    await route.abort('connectionreset');
+  });
+
+  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('连接暂时中断，正在确认安装结果。')).toBeVisible();
+  await expect(page.getByText('安装完成', { exact: true })).toBeVisible();
+  await expect(page.getByText('安装已完成，系统正在切换到正式模式')).toBeVisible();
+  await expect(page.getByText('网络请求失败')).toHaveCount(0);
+});