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/pages/base/app_base_page.py

@@ -0,0 +1,75 @@
+"""App Page Object 基类 — 各端通用 (Appium)。"""
+
+from datetime import datetime
+
+from appium.webdriver.common.appiumby import AppiumBy
+from selenium.webdriver.support.ui import WebDriverWait
+from selenium.webdriver.support import expected_conditions as EC
+
+from tests.core.allure_support import attach_png
+from tests.core.paths import SCREENSHOTS_DIR
+
+
+class AppBasePage:
+    """App Page Object 基类 — 各端通用。"""
+
+    def __init__(self, driver, platform: str, timeout_ms: int = 30_000):
+        self.driver = driver
+        self.platform = platform  # "android" | "ios"
+        self.timeout = timeout_ms / 1000
+
+    def wait_visible_by_id(self, accessibility_id: str, timeout_s: float | None = None) -> None:
+        wait = WebDriverWait(self.driver, timeout=timeout_s or self.timeout)
+        wait.until(
+            EC.visibility_of_element_located((AppiumBy.ACCESSIBILITY_ID, accessibility_id))
+        )
+
+    def wait_visible_by_text(self, text: str, timeout_s: float | None = None) -> None:
+        wait = WebDriverWait(self.driver, timeout=timeout_s or self.timeout)
+        locator = (
+            (AppiumBy.XPATH, f"//*[@text='{text}']")
+            if self.platform == "android"
+            else (AppiumBy.XPATH, f"//*[@label='{text}']")
+        )
+        wait.until(EC.visibility_of_element_located(locator))
+
+    def tap_by_id(self, accessibility_id: str) -> None:
+        self.wait_visible_by_id(accessibility_id)
+        self.driver.find_element(AppiumBy.ACCESSIBILITY_ID, accessibility_id).click()
+
+    def tap_by_text(self, text: str) -> None:
+        strategy = AppiumBy.XPATH
+        locator = (
+            f"//*[@text='{text}']"
+            if self.platform == "android"
+            else f"//*[@label='{text}']"
+        )
+        wait = WebDriverWait(self.driver, timeout=self.timeout)
+        wait.until(EC.visibility_of_element_located((strategy, locator)))
+        self.driver.find_element(strategy, locator).click()
+
+    def fill_by_id(self, accessibility_id: str, value: str) -> None:
+        self.wait_visible_by_id(accessibility_id)
+        element = self.driver.find_element(AppiumBy.ACCESSIBILITY_ID, accessibility_id)
+        element.clear()
+        element.send_keys(value)
+
+    def scroll_down(self) -> None:
+        size = self.driver.get_window_size()
+        self.driver.swipe(
+            start_x=size["width"] // 2,
+            start_y=int(size["height"] * 0.7),
+            end_x=size["width"] // 2,
+            end_y=int(size["height"] * 0.3),
+            duration=500,
+        )
+
+    def screenshot(self, name: str) -> str:
+        """关键节点截图（存盘 + attach Allure），返回文件路径。"""
+        scenario_dir = SCREENSHOTS_DIR / self.__class__.__name__
+        scenario_dir.mkdir(parents=True, exist_ok=True)
+        ts = datetime.now().strftime("%Y%m%d_%H%M%S")
+        path = str(scenario_dir / f"{name}_{self.platform}_{ts}.png")
+        self.driver.save_screenshot(path)
+        attach_png(path, name=name)
+        return path