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/diag5_login.py

@@ -0,0 +1,62 @@
+"""诊断登录流程"""
+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()
+
+    # 监听控制台
+    page.on("console", lambda msg: print(f"[console.{msg.type}] {msg.text}"))
+    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(f"\n登录页 URL: {page.url}")
+    print(f"登录页标题: {page.title()}")
+
+    # 查看所有按钮
+    buttons = page.locator('button').all()
+    print(f"\n=== 页面按钮 ({len(buttons)}) ===")
+    for i, btn in enumerate(buttons):
+        try:
+            text = btn.text_content() or ""
+            visible = btn.is_visible()
+            print(f"  [{i}] text='{text.strip()}' visible={visible}")
+        except Exception as e:
+            print(f"  [{i}] error: {e}")
+
+    # 查看所有输入框
+    inputs = page.locator('input').all()
+    print(f"\n=== 页面输入框 ({len(inputs)}) ===")
+    for i, inp in enumerate(inputs):
+        try:
+            name = inp.get_attribute('name') or ''
+            type_ = inp.get_attribute('type') or ''
+            placeholder = inp.get_attribute('placeholder') or ''
+            print(f"  [{i}] name='{name}' type='{type_}' placeholder='{placeholder}'")
+        except Exception as e:
+            print(f"  [{i}] error: {e}")
+
+    # 查看所有链接
+    links = page.locator('a').all()
+    print(f"\n=== 页面链接 ({len(links)}) ===")
+    for i, link in enumerate(links[:20]):
+        try:
+            text = link.text_content() or ""
+            href = link.get_attribute('href') or ''
+            print(f"  [{i}] text='{text.strip()}' href='{href}'")
+        except Exception as e:
+            print(f"  [{i}] error: {e}")
+
+    # 截图
+    page.screenshot(path="webtest/diag5_login.png", full_page=True)
+    print("\n截图已保存: webtest/diag5_login.png")
+
+    browser.close()