feat: 重构测试框架 — 覆盖 6 端 (管理端 + 小程序 + 4 个移动端)

目录结构:
  tests/web/admin/       管理端 (Playwright)
  tests/web/mini_program/ 司机端小程序 (Playwright/微信 WebView)
  tests/app/driver_android/  司机安卓 (Appium)
  tests/app/shipper_android/ 货主安卓 (Appium)
  tests/app/driver_ios/      司机苹果 (Appium)
  tests/app/shipper_ios/     货主苹果 (Appium)

公共模块:
  tests/app/_shared.py       driver+ensure_logged_in 工厂
  tests/app/_base_page.py    App Page Object 基类

配置:
  test_config.yaml 拆分为 6 个独立 section + 货主账号

tests/web/mini_program/pages/__init__.py

@@ -0,0 +1,31 @@
+"""小程序 Page Object 基类。"""
+
+from datetime import datetime
+from pathlib import Path
+
+from playwright.sync_api import Page, Locator, expect
+
+SCREENSHOTS_DIR = Path("output/screenshots")
+
+
+class MiniProgramBasePage:
+    """小程序 Page Object 基类。"""
+
+    def __init__(self, page: Page, timeout_ms: int = 30_000):
+        self.page = page
+        self.timeout = timeout_ms
+
+    def wait_visible(self, locator: Locator, timeout_ms: int | None = None) -> None:
+        expect(locator).to_be_visible(timeout=timeout_ms or self.timeout)
+
+    def click_when_ready(self, locator: Locator) -> None:
+        self.wait_visible(locator)
+        locator.click()
+
+    def screenshot(self, name: str) -> str:
+        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}_{ts}.png")
+        self.page.screenshot(path=path)
+        return path