fix(e2e): resolve admin user journey authentication and stabilize flaky tests

- Fix loginAdminAndSetCookie to set both cookie (middleware) and localStorage (auth-context)
- Add page navigation before localStorage evaluate to avoid SecurityError
- Update Playwright webServer to npm run dev for API route support
- Fix UJ-10 CSS selector parsing error (text= regex mixed with CSS)
- Fix cases-filter flaky test (getByRole('radio') → locator('button[role="radio"]'))
- Update test-strategy-plan.md: mark UJ-03/06/07 as ✅ completed
- Update README.md with admin fix progress record

e2e/cases-filter.spec.ts

@@ -6,17 +6,20 @@ test('案例页行业筛选按钮可以正确过滤列表', { tag: '@regression'
   // 默认显示全部 6 个案例
   await expect(page.locator('a[href^="/cases/"]')).toHaveCount(6);
 
-  // 点击“制造业”筛选
-  await page.getByRole('radio', { name: '制造业' }).click();
+  // 点击"制造业"筛选
+  await page.locator('button[role="radio"]:has-text("制造业")').click();
+  await page.waitForTimeout(500);
   await expect(page.locator('a[href^="/cases/"]')).toHaveCount(1);
   await expect(page.locator('text=大型制造企业 ERP 升级与数字化转型')).toBeVisible();
 
-  // 点击“贸易零售”筛选
-  await page.getByRole('radio', { name: '贸易零售' }).click();
+  // 点击"贸易零售"筛选
+  await page.locator('button[role="radio"]:has-text("贸易零售")').click();
+  await page.waitForTimeout(500);
   await expect(page.locator('a[href^="/cases/"]')).toHaveCount(1);
   await expect(page.locator('text=连锁零售全渠道数字化升级')).toBeVisible();
 
   // 切回全部
-  await page.getByRole('radio', { name: '全部行业' }).click();
+  await page.locator('button[role="radio"]:has-text("全部行业")').click();
+  await page.waitForTimeout(500);
   await expect(page.locator('a[href^="/cases/"]')).toHaveCount(6);
 });