Add enhanced models, scheduled jobs, per-locale templates (Phase 7b)

Backend changes for full blueprint feature parity:

Database models:
- MessageTemplate: add body_ru (locale variant), event_type field
- AlbumTracker: add track_images, track_videos, notify_favorites_only,
  include_people, include_asset_details, max_assets_to_show,
  assets_order_by, assets_order fields
- New ScheduledJob model: supports periodic_summary, scheduled_assets,
  and memory (On This Day) notification modes with full config
  (times, interval, album_mode, limit, filters, sorting)

API:
- New /api/scheduled/* CRUD endpoints for scheduled jobs
- Tracker create/update accept all new filtering fields
- Tracker response includes new fields

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/server/src/immich_watcher_server/auth/routes.py

@@ -136,3 +136,5 @@ async def needs_setup(session: AsyncSession = Depends(get_session)):
     result = await session.exec(select(func.count()).select_from(User))
     count = result.one()
     return {"needs_setup": count == 0}
+
+