feat: wire tracking-config display filters + per-tracker adaptive polling

Display filters (Immich tracking config):
- favorites_only drops events with no favorited new assets, or filters
  added_assets to favorites only
- assets_order_by/assets_order sort the rendered list
  (date / name / rating / random / none)
- max_assets_to_show caps rendered+attached media (default 5 -> 10)
- include_tags strips people from event extras and tags from each asset
- include_asset_details strips city/country/state/lat/lon/is_favorite/
  rating/description; load-bearing fields (thumbhash, file_size,
  playback_size, cache keys) preserved
- New apply_tracking_display_filters helper in dispatch_helpers; wired
  into watcher, webhooks, scheduled/periodic/memory, and manual
  test-dispatch
- Targets sharing a TrackingConfig dispatch together; targets with
  different TCs each see their own shaped event

Adaptive polling:
- Replace NotificationTracker.batch_duration with adaptive_max_skip
- Per-tracker opt-in: NULL/0 disables back-off (every tick runs);
  positive N caps the skip factor at (N-1)-in-N after long idle
- Scheduler caches the cap in module state for the tick fast-path
- Migration adds the new column; API schemas/responses, frontend types,
  i18n, and the tracker form updated to match

frontend/src/lib/i18n/en.json

@@ -250,7 +250,8 @@
 		"descending": "Descending",
 		"quietHoursStart": "Quiet hours start",
 		"quietHoursEnd": "Quiet hours end",
-		"batchDuration": "Batch duration (seconds)",
+		"adaptiveMaxSkip": "Adaptive polling cap",
+		"adaptiveMaxSkipPlaceholder": "Off (blank or 0)",
 		"defaultTrackingConfig": "Default tracking config",
 		"defaultTemplateConfig": "Default template config",
 		"linkedTargets": "targets",
@@ -755,7 +756,7 @@
 		"trackingConfig": "Controls which events trigger notifications and how assets are filtered.",
 		"templateConfig": "Controls the message format. Uses default templates if not set.",
 		"scanInterval": "How often to poll the provider for changes, in seconds. Lower = faster detection but more API calls.",
-		"batchDuration": "Time to accumulate changes before dispatching notifications. 0 = send immediately.",
+		"adaptiveMaxSkip": "Reduces polling when the tracker is idle, to save load on the upstream server. Leave blank or set to 0 for snappy notifications — every tick runs at the configured interval. Set to 2 to allow up to 2× slower polling after ~5 min of silence, or 4 for up to 4× slower polling after ~15 min. Activity resets back to the base rate immediately.",
 		"defaultTrackingConfig": "Applied to all linked targets unless overridden per target.",
 		"defaultTemplateConfig": "Applied to all linked targets unless overridden per target.",
 		"defaultCount": "How many results to return when the user doesn't specify a count (1-20).",