实现付款后订单监控：真实探测 order.my.rakuten.co.jp 配送阶段

用真实订单号 306087-20260813-0863947697 探测 order.my.rakuten.co.jp（订单列表/
详情页），拿到真实 DOM 结构后实现 SiteInteractor.check_order_status：

- 详情页 URL 可直接从 site_order_id 构造（shop_id 是订单号第一段）
- 配送阶段用「进度条」组件的 4 个固定阶段（ショップ/出荷/配達店/配達完了），
  当前阶段的 class 带 -active-- 中缀，映射到 OrderState.SHIPPED/DELIVERED
- 查不到订单号、进度条解析不出新阶段都不算错误，交给轮询循环继续重试

runner.WorkerRunner 新增 _monitor_order 后台轮询：付款成功上报后以
asyncio.create_task 起后台任务（不阻塞主循环领下一单，因为 SiteInteractor 的
Playwright 操作全程持锁串行化），状态变化时用 terminal=False 追加 report；
新增 cancel_monitors() 在服务关闭时于 SiteInteractor.close() 之前收尾。

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/test_site_interact.py

@@ -17,13 +17,16 @@ import pytest
 
 from app.shared.errors import CartOperationError, InvalidRequestError, OrderOperationError
 from app.trading.worker.models import LeaseTask
+from app.shared.task_state import OrderState
 from app.trading.worker.site_interact import (
     CheckoutSummary,
+    OrderStatusSnapshot,
     SiteInteractor,
     _extract_error_message,
     _extract_purchase_fields,
     _parse_checkout_summary,
     _parse_initial_state,
+    _parse_order_status,
 )
 
 FIXTURES = Path(__file__).parent / "fixtures"
@@ -250,13 +253,80 @@ def test_site_interactor_construction_does_not_require_playwright():
     assert site._per_task_state == {}
 
 
-# ---- monitor 仍未实现，抛 NotImplementedError ----
+# ---- _parse_order_status：付款后监控的解析核心，2026-08-13 用真实订单号
+# 306087-20260813-0863947697 的详情页 HTML 验证过（见 _ORDER_STEPPER_ITEM_PATTERN
+# 上方注释）。下面 fixture 里的 4 个 <li> 是从真实页面摘录的进度条结构原样保留，
+# 只是把每个 class 里易变的 CSS modules hash 换成了固定占位，不影响所依赖的
+# `-active--` 中缀。
+
+_REAL_ORDER_ID = "306087-20260813-0863947697"
 
 
-async def test_monitor_unimplemented():
+def _stepper_html(*, active_stage: str | None, order_id: str = _REAL_ORDER_ID) -> str:
+    """构造「订单号 + 4 阶段进度条」的最小 fixture，active_stage 指定哪一阶带 -active-- class"""
+    stages = ["ショップ", "出荷", "配達店", "配達完了"]
+    items = []
+    for i, stage in enumerate(stages):
+        active_cls = " item-shipping-active--1mu0i" if stage == active_stage else ""
+        items.append(
+            f'<li class="item--3gWCU item-{i}--hash title-m--3FZT3{active_cls}">'
+            f'<div class="title--2uGVi">{stage}</div></li>'
+        )
+    return f"<div>注文番号：{order_id}</div><ul>{''.join(items)}</ul>"
+
+
+def test_parse_order_status_not_found_when_order_id_missing():
+    snapshot = _parse_order_status(_stepper_html(active_stage="ショップ", order_id="999999-x"), _REAL_ORDER_ID)
+    assert snapshot.found is False
+    assert snapshot.order_state is None
+
+
+def test_parse_order_status_shop_stage_has_no_order_state_mapping():
+    """「ショップ」（已接单未发货）阶段没有对应的 OrderState——已经在 ORDERED/PAID 报过了"""
+    snapshot = _parse_order_status(_stepper_html(active_stage="ショップ"), _REAL_ORDER_ID)
+    assert snapshot.found is True
+    assert snapshot.stage_label == "ショップ"
+    assert snapshot.order_state is None
+
+
+def test_parse_order_status_shipped_stage_maps_to_shipped():
+    snapshot = _parse_order_status(_stepper_html(active_stage="出荷"), _REAL_ORDER_ID)
+    assert snapshot.order_state == OrderState.SHIPPED
+
+
+def test_parse_order_status_depot_stage_also_maps_to_shipped():
+    """「配達店」（配送网点中转）没有单独状态，归入 SHIPPED"""
+    snapshot = _parse_order_status(_stepper_html(active_stage="配達店"), _REAL_ORDER_ID)
+    assert snapshot.order_state == OrderState.SHIPPED
+
+
+def test_parse_order_status_delivered_stage_maps_to_delivered():
+    snapshot = _parse_order_status(_stepper_html(active_stage="配達完了"), _REAL_ORDER_ID)
+    assert snapshot.order_state == OrderState.DELIVERED
+
+
+def test_parse_order_status_no_active_marker_returns_found_without_state():
+    """进度条 4 项都没有 -active-- class（页面结构变了/解析不出）：found 但 order_state=None"""
+    snapshot = _parse_order_status(_stepper_html(active_stage=None), _REAL_ORDER_ID)
+    assert snapshot.found is True
+    assert snapshot.order_state is None
+    assert snapshot.stage_label is None
+
+
+def test_order_status_snapshot_defaults():
+    s = OrderStatusSnapshot(found=False)
+    assert s.stage_label is None
+    assert s.order_state is None
+    assert s.html == ""
+
+
+# ---- check_order_status 在没启动 Playwright 时应失败 ----
+
+
+async def test_check_order_status_without_start_raises():
     site = SiteInteractor(auth_session=None, settings=None)  # type: ignore[arg-type]
-    with pytest.raises(NotImplementedError):
-        await site.monitor(_make_task(), "ord-1")
+    with pytest.raises((AttributeError, TypeError)):
+        await site.check_order_status(_REAL_ORDER_ID)
 
 
 # ---- submit_order / pay：没有 enter_checkout 留存的确认页会话时应报错，不静默成功 ----