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/config.py

@@ -29,6 +29,7 @@ class Settings(BaseSettings):
     # Telegram webhook secret (used to validate incoming webhook requests)
     telegram_webhook_secret: str = ""
 
+
     model_config = {"env_prefix": "IMMICH_WATCHER_"}
 
     @property