Add Airframes ACARS datalink on plane dossiers and Meshtastic planet scan.

Bulk-ingest Airframes messages on a rate-limited staggered queue with instant cache lookups and priority per-aircraft refresh when opening a dossier; add Meshtastic manual SCAN PLANET control in the SIGINT panel.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/services/data_fetcher.py

@@ -77,6 +77,7 @@ from services.fetchers.infrastructure import (  # noqa: F401
     fetch_psk_reporter,
 )
 from services.fetchers.road_corridor_sat import fetch_road_corridor_trends  # noqa: F401
+from services.fetchers.airframes import sync_airframes_messages  # noqa: F401
 from services.fetchers.geo import (  # noqa: F401
     fetch_ships,
     fetch_airports,
@@ -1263,6 +1264,17 @@ def start_scheduler():
         next_run_time=datetime.utcnow() + timedelta(minutes=5),  # first snapshot 5m after startup
     )
 
+    _airframes_interval_m = max(5, int(os.environ.get("AIRFRAMES_SYNC_INTERVAL_MINUTES", "15")))
+    _scheduler.add_job(
+        lambda: _run_task_with_health(sync_airframes_messages, "sync_airframes_messages"),
+        "interval",
+        minutes=_airframes_interval_m,
+        id="airframes_datalink",
+        max_instances=1,
+        misfire_grace_time=120,
+        next_run_time=datetime.utcnow() + timedelta(seconds=90),
+    )
+
     _scheduler.start()
     logger.info("Scheduler started.")