智教助手平台：完整初始化

- 前端：Vue3 + TS + Element Plus，24 个页面路由（课件/组题/教案/动画/思维导图/作文批改/命题/课堂/资源/社区等）
- 后端：FastAPI + SQLAlchemy + SQLite，17 个路由模块，AI 服务层含降级模板
- AI：glm-5.x 推理模型已禁用思维链，确保输出真实内容
- 修复：ai_service 两处请求体注入 enable_thinking/thinking disabled
- 测试账号：13900999999 / test1234

frontend/_verify_404.cjs

@@ -0,0 +1,55 @@
+const { chromium } = require('playwright-core');
+(async () => {
+  const CHROME = String.raw`C:\Program Files\Google\Chrome\Application\chrome.exe`;
+  const browser = await chromium.launch({ executablePath: CHROME, headless: true });
+  const page = await browser.newPage({ viewport: { width: 1280, height: 800 } });
+  const errs = [];
+  page.on('pageerror', e => errs.push(e.message));
+  page.on('console', m => { if (m.type()==='error') errs.push(m.text()); });
+
+  // 1) Verify SEO meta tags on a normal page
+  await page.goto('http://127.0.0.1:5175/login');
+  await page.waitForTimeout(2000);
+  const desc = await page.locator('meta[name="description"]').getAttribute('content').catch(()=> '');
+  const ogTitle = await page.locator('meta[property="og:title"]').getAttribute('content').catch(()=> '');
+  const themeColor = await page.locator('meta[name="theme-color"]').getAttribute('content').catch(()=> '');
+  const noscript = await page.locator('noscript').count();
+  console.log('META description:', desc ? desc.slice(0,50)+'...' : 'MISSING');
+  console.log('META og:title:', ogTitle || 'MISSING');
+  console.log('META theme-color:', themeColor || 'MISSING');
+  console.log('noscript fallback:', noscript > 0 ? 'PRESENT' : 'MISSING');
+
+  // 2) Test shallow 404 (within AppLayout)
+  await page.goto('http://127.0.0.1:5175/nonexistent-page');
+  await page.waitForTimeout(1500);
+  const title404 = (await page.locator('.nf-title').textContent().catch(()=> '')) || '';
+  const code404 = (await page.locator('.nf-code').textContent().catch(()=> '')) || '';
+  console.log('\nSHALLOW 404 (/nonexistent-page):');
+  console.log('  nf-code:', code404.trim());
+  console.log('  nf-title:', title404.trim());
+  console.log('  has home btn:', await page.locator('.nf-btn.primary').count());
+
+  // 3) Test deep 404
+  await page.goto('http://127.0.0.1:5175/foo/bar/baz/deep');
+  await page.waitForTimeout(1500);
+  const deepTitle = (await page.locator('.nf-title').textContent().catch(()=> '')) || '';
+  console.log('\nDEEP 404 (/foo/bar/baz/deep):');
+  console.log('  nf-title:', deepTitle.trim());
+
+  // 4) Test that clicking "返回首页" works
+  await page.goto('http://127.0.0.1:5175/xyz');
+  await page.waitForTimeout(1500);
+  await page.locator('.nf-btn.primary').click();
+  await page.waitForTimeout(1500);
+  console.log('\nCLICK HOME -> url:', page.url());
+  console.log('  landed on home:', page.url().endsWith('/login') || page.url().endsWith('/5175/'));
+
+  // 5) screenshot
+  await page.goto('http://127.0.0.1:5175/nonexistent');
+  await page.waitForTimeout(1500);
+  await page.screenshot({ path: '../audit_shots/_404_page.png' });
+
+  console.log('\nERRORS:', errs.length);
+  if (errs.length) console.log('ERR_DETAIL:', [...new Set(errs)].slice(0,5));
+  await browser.close();
+})();