feat(T-002): 建立核心数据模型与状态枚举

- src/core/status.py: TaskStatus 六态枚举，英文成员 + display_name/from_display
  中英映射（单一事实源），对齐 04-architecture.md §3.4。
- src/core/models.py: OrderTask dataclass，字段集合/类型对齐 §3.3；支付模式不挂模型。
- tests/test_models.py: 枚举完整性/双向映射/未知值报错/默认值/实例独立性。
- 文档同步：04 §3.4 约定补 from_display；tasks/progress/current-state 更新。

验证：compileall OK；unittest Ran 10 tests, OK。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_models.py

@@ -0,0 +1,88 @@
+"""核心数据模型与状态枚举测试（T-002）。"""
+import unittest
+from datetime import datetime
+from decimal import Decimal
+
+from src.core.models import OrderTask
+from src.core.status import TaskStatus
+
+
+class TaskStatusTest(unittest.TestCase):
+    # 与 04-architecture.md §3.4 中英映射表保持一致
+    EXPECTED = {
+        TaskStatus.PENDING: "待执行",
+        TaskStatus.RUNNING: "执行中",
+        TaskStatus.MANUAL: "待人工",
+        TaskStatus.SUCCESS: "成功",
+        TaskStatus.FAILED: "失败",
+        TaskStatus.CANCELLED: "已取消",
+    }
+
+    def test_members_complete(self):
+        """枚举成员恰好为文档定义的六个。"""
+        self.assertEqual(set(TaskStatus), set(self.EXPECTED))
+
+    def test_display_name(self):
+        for status, zh in self.EXPECTED.items():
+            self.assertEqual(status.display_name, zh)
+
+    def test_display_names_unique(self):
+        names = [s.display_name for s in TaskStatus]
+        self.assertEqual(len(names), len(set(names)))
+
+    def test_from_display_roundtrip(self):
+        for status in TaskStatus:
+            self.assertIs(TaskStatus.from_display(status.display_name), status)
+
+    def test_from_display_unknown_raises(self):
+        with self.assertRaises(ValueError):
+            TaskStatus.from_display("不存在的状态")
+
+
+class OrderTaskTest(unittest.TestCase):
+    def _minimal(self) -> OrderTask:
+        return OrderTask(
+            task_id="T1",
+            row_index=2,
+            product_url="https://example.com/p",
+            sku_text="颜色=黑色;尺码=XL",
+            quantity=1,
+        )
+
+    def test_defaults(self):
+        task = self._minimal()
+        self.assertEqual(task.status, TaskStatus.PENDING)
+        self.assertEqual(task.sku_items, {})
+        self.assertIsNone(task.order_no)
+        self.assertIsNone(task.expected_amount)
+
+    def test_sku_items_not_shared(self):
+        """default_factory 确保每个实例拥有独立 dict，不互相串改。"""
+        a = self._minimal()
+        b = self._minimal()
+        a.sku_items["颜色"] = "黑色"
+        self.assertEqual(b.sku_items, {})
+
+    def test_full_construction(self):
+        task = OrderTask(
+            task_id="T2",
+            row_index=3,
+            product_url="https://example.com/p2",
+            sku_text="套餐=单件",
+            quantity=2,
+            sku_items={"套餐": "单件"},
+            product_name="测试商品",
+            expected_amount=Decimal("9.90"),
+            max_pay_amount=Decimal("10.00"),
+            status=TaskStatus.SUCCESS,
+            order_no="2026000001",
+            started_at=datetime(2026, 6, 24, 10, 0, 0),
+        )
+        self.assertEqual(task.quantity, 2)
+        self.assertEqual(task.expected_amount, Decimal("9.90"))
+        self.assertEqual(task.status, TaskStatus.SUCCESS)
+        self.assertEqual(task.sku_items["套餐"], "单件")
+
+
+if __name__ == "__main__":
+    unittest.main()