refactor(tests): restructure into layered POM architecture with Allure reporting

- Split framework into core/ (config, logger, db, driver factories, screenshot,
  allure integration) and pages/ (PO layer: base/admin/driver); flatten test
  files per platform (web/admin, app/driver_android, cross_end)
- Slim root conftest.py 656 -> ~100 lines: drop inline CN HTML report, add
  Allure severity mapping (p0/p1/p2 -> blocker/normal/minor) and
  environment.properties; support both tests.*-prefixed and bare imports
- Preserve TC-D2S-001/002 cross-end E2E cases with business logic unchanged,
  add allure epic/feature/story/step annotations
- Deduplicate: single makereport hook, shared failure-screenshot helpers,
  single SCREENSHOTS_DIR constant; deterministic auth-state role loading
- Move DB credentials from db_helper.py into test_config.yaml (database section)
- Move pytest.ini to repo root; switch reporting to allure-pytest
  (drop pytest-html/junitxml); update requirements.txt accordingly
- Delete deprecated scaffolding: test_freight_full_flow + 6 stale page
  objects, iOS/shipper empty shells, dead utils
- Fix flaky vxe-table action-row wait: wait for a visible td instead of
  hidden placeholder rows (fixed shipper-payment timeouts)
- Verified end-to-end against live env: both E2E cases pass (2 passed 3m12s);
  run artifacts (logs/screenshots/allure) included per repo convention

tests/web/admin/test_login.py

@@ -0,0 +1,91 @@
+"""管理端登录测试用例。
+
+标记:
+    pytest -m admin            # 仅管理端用例
+    pytest -m p0               # P0 冒烟
+    pytest -m smoke            # 冒烟
+"""
+
+import allure
+import pytest
+from playwright.sync_api import Page
+
+pytestmark = [pytest.mark.admin]
+
+
+@allure.epic("运八网络货运平台")
+@allure.feature("管理端")
+class TestAdminSmoke:
+    """管理端冒烟 — 验证预登录态。"""
+
+    @allure.story("预登录态访问")
+    @allure.title("验证预登录态可直接访问管理后台")
+    @pytest.mark.p0
+    @pytest.mark.smoke
+    def test_admin_access_with_saved_auth(self, page: Page, admin_config, ensure_login):
+        """验证预登录态可直接访问管理后台。"""
+        ensure_login("super_admin")
+        page.goto(admin_config["base_url"])
+        page.wait_for_timeout(2000)
+        assert "#/login" not in page.url and "/login" not in page.url, (
+            "预登录态失效！请运行: python tests/web/admin/save_auth.py"
+        )
+
+    @allure.story("预登录态访问")
+    @allure.title("验证车队长预登录态有效")
+    @pytest.mark.p0
+    @pytest.mark.smoke
+    def test_team_leader_access(self, page: Page, admin_config, ensure_login):
+        """验证车队长预登录态有效。"""
+        ensure_login("team_leader")
+        page.goto(admin_config["base_url"])
+        page.wait_for_timeout(2000)
+        assert "#/login" not in page.url and "/login" not in page.url
+
+    @allure.story("预登录态访问")
+    @allure.title("验证首页可正常加载")
+    @pytest.mark.p0
+    @pytest.mark.smoke
+    def test_dashboard_loads(self, page: Page, admin_config, ensure_login):
+        """验证首页可正常加载。"""
+        ensure_login("super_admin")
+        page.goto(admin_config["base_url"])
+        assert page.title(), "首页应显示页面标题"
+
+
+@allure.epic("运八网络货运平台")
+@allure.feature("管理端")
+class TestLoginPage:
+    """登录页交互验证。"""
+
+    @allure.story("登录页")
+    @allure.title("验证登录页可正常访问")
+    @pytest.mark.p1
+    def test_login_page_accessible(self, page: Page, admin_config):
+        """验证登录页可正常访问。"""
+        page.goto(f"{admin_config['base_url']}/#/login")
+        assert page.get_by_placeholder("请输入用户名").is_visible()
+
+    @allure.story("登录页")
+    @allure.title("验证登录页元素完整")
+    @pytest.mark.p1
+    def test_login_page_elements(self, page: Page, admin_config):
+        """验证登录页元素完整。"""
+        page.goto(f"{admin_config['base_url']}/#/login")
+        assert page.get_by_placeholder("请输入用户名").is_visible()
+        assert page.get_by_placeholder("请输入密码").is_visible()
+        assert page.get_by_role("button", name="登录").is_visible()
+
+    @allure.story("登录页")
+    @allure.title("验证已登录用户访问登录页被重定向")
+    @pytest.mark.p1
+    def test_session_redirect(self, page: Page, admin_config, ensure_login):
+        """验证已登录用户访问登录页被重定向。"""
+        ensure_login("super_admin")
+        page.goto(admin_config["base_url"])
+        page.wait_for_timeout(2000)
+        assert "#/login" not in page.url
+
+        page.goto(f"{admin_config['base_url']}/#/login")
+        page.wait_for_timeout(2000)
+        assert "#/login" not in page.url and "/login" not in page.url