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

tests/webapp/debug_announcements.py

@@ -0,0 +1,58 @@
+"""调试 admin 访问 /announcements 的 500 错误"""
+from playwright.sync_api import sync_playwright
+import re
+
+BASE_URL = "http://localhost:3000"
+
+with sync_playwright() as p:
+    browser = p.chromium.launch(headless=True)
+    context = browser.new_context(viewport={"width": 1440, "height": 900}, locale="zh-CN")
+    page = context.new_page()
+
+    # 收集控制台错误
+    errors = []
+    page_errors = []
+    def on_console(msg):
+        if msg.type == "error":
+            errors.append(msg.text)
+    def on_pageerror(err):
+        page_errors.append(str(err))
+    page.on("console", on_console)
+    page.on("pageerror", on_pageerror)
+
+    # 登录 admin
+    page.goto(f"{BASE_URL}/login", timeout=30000)
+    page.wait_for_load_state("networkidle", timeout=15000)
+    page.locator('input[name="email"]').fill("admin@xiaoxue.edu.cn")
+    page.locator('input[name="password"]').fill("123456")
+    login_btn = page.get_by_role("button", name=re.compile(r"Sign In with Email", re.I))
+    login_btn.click()
+    page.wait_for_timeout(3000)
+    page.wait_for_load_state("networkidle", timeout=15000)
+    print(f"登录后 URL: {page.url}")
+
+    # 访问 /announcements
+    print("\n访问 /announcements...")
+    response = page.goto(f"{BASE_URL}/announcements", timeout=30000)
+    print(f"HTTP 状态: {response.status if response else 'None'}")
+    page.wait_for_load_state("networkidle", timeout=15000)
+    page.wait_for_timeout(2000)
+    print(f"最终 URL: {page.url}")
+
+    # 获取页面内容
+    body = page.locator("body").text_content()
+    print(f"\n页面内容 (前 2000 字符):")
+    print(body[:2000] if body else "(空)")
+
+    # 截图
+    page.screenshot(path="tests/webapp/screenshots/announcements_messages/debug_announcements_admin.png", full_page=True)
+
+    print(f"\n控制台错误 ({len(errors)} 条):")
+    for e in errors[:10]:
+        print(f"  - {e[:200]}")
+
+    print(f"\n页面错误 ({len(page_errors)} 条):")
+    for e in page_errors[:10]:
+        print(f"  - {e[:300]}")
+
+    browser.close()