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/core/logger.py

@@ -0,0 +1,46 @@
+"""统一日志工具。
+
+Usage:
+    from tests.core.logger import get_logger
+
+    logger = get_logger(__name__)
+    logger.info("开始执行用例")
+    logger.error(f"用例失败: {e}")
+"""
+
+import logging
+import sys
+from datetime import datetime
+
+from tests.core.paths import LOGS_DIR
+
+LOGS_DIR.mkdir(parents=True, exist_ok=True)
+
+# 日志格式
+_FORMAT = "%(asctime)s [%(levelname)s] %(name)s — %(message)s"
+_DATE_FMT = "%Y-%m-%d %H:%M:%S"
+
+# 根 logger 配置（模块级，只初始化一次）
+_ROOT_LOGGER = logging.getLogger("tests")
+_ROOT_LOGGER.setLevel(logging.DEBUG)
+
+# 控制台 Handler
+_console_handler = logging.StreamHandler(sys.stdout)
+_console_handler.setLevel(logging.INFO)
+_console_handler.setFormatter(logging.Formatter(_FORMAT, datefmt=_DATE_FMT))
+
+# 文件 Handler（每次运行一个日志文件）
+_log_file = LOGS_DIR / f"test_run_{datetime.now().strftime('%Y%m%d_%H%M%S')}.log"
+_file_handler = logging.FileHandler(_log_file, encoding="utf-8")
+_file_handler.setLevel(logging.DEBUG)
+_file_handler.setFormatter(logging.Formatter(_FORMAT, datefmt=_DATE_FMT))
+
+_ROOT_LOGGER.addHandler(_console_handler)
+_ROOT_LOGGER.addHandler(_file_handler)
+
+
+def get_logger(name: str) -> logging.Logger:
+    """获取以 `tests.` 为前缀的子 logger。"""
+    if not name.startswith("tests."):
+        name = f"tests.{name}"
+    return logging.getLogger(name)