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

pytest.ini

@@ -0,0 +1,39 @@
+[pytest]
+# pytest 配置文件（项目根目录）
+
+# 测试发现路径
+testpaths = tests
+
+# 仅执行以 test_ 开头的文件
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+
+# 默认命令行参数
+addopts =
+    -v
+    --tb=short
+    --strict-markers
+    --disable-warnings
+    -p no:cacheprovider
+    --alluredir=output/allure-results
+    --clean-alluredir
+
+# 自定义 markers
+markers =
+    p0: P0 核心流程（冒烟测试）
+    p1: P1 主要功能
+    p2: P2 次要/异常流程
+    smoke: 冒烟测试
+    admin: 管理端 (Playwright)
+    mini_program: 司机端小程序 (miniprogram-automator)
+    driver_android: 司机安卓端 (Appium)
+    appium: 所有 Appium 测试
+    playwright: 所有 Playwright 测试
+    cross_end: 跨端 E2E 测试（管理端 + 司机安卓端联动）
+
+# 日志格式
+log_cli = true
+log_cli_level = INFO
+log_cli_format = %(asctime)s [%(levelname)s] %(name)s — %(message)s
+log_cli_date_format = %H:%M:%S