feat(podcasts): add zero publication migration

surfsense_backend/alembic/versions/157_publish_podcasts_to_zero.py

@@ -0,0 +1,27 @@
+"""publish podcasts to zero_publication
+
+Reconciles ``zero_publication`` after migration 156 added the lifecycle columns,
+so the frontend observes podcast status and the reviewable brief by push.
+
+Revision ID: 157
+Revises: 156
+"""
+
+from collections.abc import Sequence
+
+from alembic import op
+
+from app.zero_publication import apply_publication
+
+revision: str = "157"
+down_revision: str | None = "156"
+branch_labels: str | Sequence[str] | None = None
+depends_on: str | Sequence[str] | None = None
+
+
+def upgrade() -> None:
+    apply_publication(op.get_bind())
+
+
+def downgrade() -> None:
+    """No-op. Historical publication shapes are immutable."""