feat(commands): drop tracker counts from /status

trackers_active / trackers_total are per-provider aggregates — once the
rest of /status is scoped to the chat's album set (total_albums and
last_event both filtered by the derived scope), leaving tracker counts
in would leak info about trackers this chat has no visibility into.

- _cmd_status no longer emits trackers_active / trackers_total.
- Immich default status templates (en, ru) just show Albums + Last event.
- Variable catalog updated so the template editor stops suggesting the
  removed vars for the Immich /status slot.

packages/core/src/notify_bridge_core/templates/command_defaults/en/status.jinja2

@@ -1,4 +1,3 @@
 📊 Status
-Trackers: {{ trackers_active }}/{{ trackers_total }} active
 Albums: {{ total_albums }}
-Last event: {{ last_event }}
+Last event: {{ last_event }}

packages/core/src/notify_bridge_core/templates/command_defaults/ru/status.jinja2

@@ -1,4 +1,3 @@
 📊 Статус
-Трекеры: {{ trackers_active }}/{{ trackers_total }} активных
 Альбомы: {{ total_albums }}
-Последнее событие: {{ last_event }}
+Последнее событие: {{ last_event }}