feat(podcasts): add module package init

surfsense_backend/app/podcasts/__init__.py

@@ -0,0 +1,10 @@
+"""Podcast generation: brief resolution, transcript drafting, and audio rendering.
+
+The public surface grows as the module is built. For now it owns the
+``podcasts`` table model, which :mod:`app.db` re-exports so existing
+``from app.db import Podcast`` call sites keep working during the migration.
+"""
+
+from __future__ import annotations
+
+__all__: list[str] = []