feat(store_mapping): 淘宝缓存 deeplink 失效检测→标记→回退(app-server 侧) (#53)

加 taobao_deeplink_invalid_at 列(迁移+model);mark_taobao_deeplink_invalid 按 shopId 标记所有行;lookup_nearest 过滤失效淘宝候选;新增 POST /internal/store-mapping/invalidate。+ 7 单测。

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

Reviewed-on: #53

alembic/versions/store_mapping_tb_dl_invalid.py

@@ -0,0 +1,33 @@
+"""store_mapping 加淘宝 deeplink 失效标记列 taobao_deeplink_invalid_at
+
+Revision ID: store_mapping_tb_dl_invalid
+Revises: coupon_engage_per_package
+Create Date: 2026-06-15 00:00:00.000000
+
+缓存的淘宝店内搜索 deeplink 会失效(打开是"页面出错了"降级页)。pricebot 比价撞到错误页时
+回退正常搜店, 并 server→server 通知把该 shopId 的 deeplink 标记失效。本列记失效时刻
+(NULL=有效); lookup 反查时过滤掉已失效的淘宝候选, 不再返回坏 deeplink。
+只加淘宝一列(当前只接淘宝); 用时间戳而非布尔: 留痕可审计、可统计失效率, 且不销毁原 deeplink。
+无需索引: 过滤总叠在 name_taobao== 之后, 候选集已小。
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'store_mapping_tb_dl_invalid'
+down_revision: Union[str, Sequence[str], None] = 'coupon_engage_per_package'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    with op.batch_alter_table('store_mapping', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('taobao_deeplink_invalid_at', sa.DateTime(timezone=True), nullable=True))
+
+
+def downgrade() -> None:
+    with op.batch_alter_table('store_mapping', schema=None) as batch_op:
+        batch_op.drop_column('taobao_deeplink_invalid_at')