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/data_helper.py

@@ -0,0 +1,39 @@
+"""测试数据生成辅助工具。
+
+Usage:
+    from tests.core.data_helper import generate_order_no, generate_phone
+
+    order_no = generate_order_no()
+    phone = generate_phone()
+"""
+
+import random
+import string
+from datetime import datetime
+
+
+def generate_order_no(prefix: str = "TEST") -> str:
+    """生成唯一订单号。"""
+    ts = datetime.now().strftime("%Y%m%d%H%M%S")
+    rand = "".join(random.choices(string.digits, k=4))
+    return f"{prefix}{ts}{rand}"
+
+
+def generate_phone() -> str:
+    """生成合法格式的测试手机号（138 开头）。"""
+    suffix = "".join(random.choices(string.digits, k=8))
+    return f"138{suffix}"
+
+
+def generate_shipment_no(prefix: str = "YB") -> str:
+    """生成运单号（格式: YB + 日期 + 随机数）。"""
+    ts = datetime.now().strftime("%Y%m%d")
+    rand = "".join(random.choices(string.digits, k=6))
+    return f"{prefix}{ts}{rand}"
+
+
+def generate_unique_id(prefix: str = "id") -> str:
+    """生成通用唯一 ID。"""
+    ts = datetime.now().strftime("%Y%m%d%H%M%S%f")
+    rand = "".join(random.choices(string.ascii_lowercase + string.digits, k=4))
+    return f"{prefix}_{ts}_{rand}"