fix(alembic): 合并多 head (store_mapping_jd_dl_invalid + ad_revenue) 修复 0.1.2 部署

PR #56 的 jd_deeplink_invalid 迁移与 ad_revenue 报表迁移从同一 branchpoint
分叉成双 head, 部署时 alembic upgrade head 报 "Multiple head revisions"。
加一个 no-op merge 节点统一 DAG, 两支迁移列不冲突。

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

alembic/versions/45047b5a884c_merge_store_mapping_jd_dl_invalid_and_.py

@@ -0,0 +1,26 @@
+"""merge store_mapping_jd_dl_invalid and ad_revenue heads (0.1.2)
+
+Revision ID: 45047b5a884c
+Revises: d4e68464761d, store_mapping_jd_dl_invalid
+Create Date: 2026-06-16 01:38:26.273226
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = '45047b5a884c'
+down_revision: Union[str, Sequence[str], None] = ('d4e68464761d', 'store_mapping_jd_dl_invalid')
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    pass
+
+
+def downgrade() -> None:
+    pass