test: update and add E2E, integration, visual, and webapp tests

- Update E2E tests: announcements, auth, auth-business-flow, full-route-regression, grades, navigation, smoke-auth, teacher-web-test

- Update integration tests: api-ai-chat, api-onboarding-complete, api-onboarding-status, proxy-guard, integration setup

- Update visual regression tests: admin-dashboard, homepage, student-dashboard, teacher-dashboard, visual config, helpers

- Update webapp tests: admin, parent, student full tests and debug scripts

- Add new webapp tests: announcements_messages, settings_profile, debug scripts

- Add webtest directory with test plans, screenshots, and diagnostic scripts

webtest/diag6_login.py

@@ -0,0 +1,51 @@
+"""诊断登录流程 - 详细版"""
+import re
+from playwright.sync_api import sync_playwright
+
+BASE_URL = "http://localhost:3000"
+
+with sync_playwright() as p:
+    browser = p.chromium.launch(headless=True)
+    context = browser.new_context()
+    page = context.new_page()
+
+    # 监听响应
+    def on_response(response):
+        url = response.url
+        if '/api/auth' in url or '/login' in url or '/teacher' in url:
+            print(f"[response] {response.status} {url[:100]}")
+
+    page.on("response", on_response)
+    page.on("pageerror", lambda err: print(f"[pageerror] {err}"))
+
+    print(">>> 访问登录页...")
+    page.goto(f"{BASE_URL}/login", timeout=30000)
+    page.wait_for_load_state("networkidle", timeout=15000)
+    page.wait_for_timeout(1000)
+
+    print("\n>>> 填写表单...")
+    page.locator('input[name="email"]').fill("t_chinese_1@xiaoxue.edu.cn")
+    page.locator('input[name="password"]').fill("123456")
+
+    print(">>> 点击登录按钮...")
+    page.get_by_role("button", name=re.compile(r"Sign In with Email", re.I)).click()
+
+    # 等待跳转
+    try:
+        page.wait_for_url("**/teacher/**", timeout=15000)
+        print(f"✓ 跳转成功: {page.url}")
+    except Exception:
+        print(f"✗ 未跳转到 /teacher/*，当前 URL: {page.url}")
+
+    page.wait_for_timeout(3000)
+    print(f"最终 URL: {page.url}")
+
+    # 截图
+    page.screenshot(path="webtest/diag6_after_login.png", full_page=True)
+    print("截图已保存: webtest/diag6_after_login.png")
+
+    # 检查页面内容
+    body_text = page.locator('body').text_content() or ""
+    print(f"\n页面文本前 500 字符: {body_text[:500]}")
+
+    browser.close()