Wire ADS-B end to end: telemetry ingestion + live map overlay

node-26#9. Adds POST /telemetry/adsb (node-key authed via
require_node_service_or_firebase_token) that upserts one Firestore doc per
icao into a new `aircraft` collection, org_id stamped from the reporting
node the same way upload.py defensively stamps `calls`. firestore.rules
gets a matching docInMyOrg()-gated read rule.

Frontend: useAircraft() mirrors useNodes()'s onSnapshot pattern, filtering
docs older than 2 minutes client-side since nothing prunes a stale aircraft
doc server-side yet. MapView gets an opt-in "Aircraft" overlay (unchecked
by default, like the weather radar layer) rendering a rotated plane glyph
per sighting.

Unverified via typecheck — no Node.js/npm on this authoring box yet (see
CLAUDE.md Testing reality). Server side is pytest-covered (test_telemetry.py).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

drb-c2-core/app/main.py

@@ -17,7 +17,7 @@ from app.internal.auth import (
     require_node_service_or_firebase_token,
 )
 from app.routers import nodes, systems, calls, upload, tokens, incidents, alerts, admin, trips, places, links, users
-from app.routers import enrollment, media, org, waitlist
+from app.routers import enrollment, media, org, waitlist, telemetry
 from app.internal import dynsec
 from app.internal import firestore as fstore
 
@@ -120,6 +120,7 @@ app.include_router(nodes.router,     dependencies=[Depends(require_service_or_fi
 # write routes inside carry their own require_admin_token, so nodes get read
 # access only.
 app.include_router(systems.router,   dependencies=[Depends(require_node_service_or_firebase_token)])
+app.include_router(telemetry.router, dependencies=[Depends(require_node_service_or_firebase_token)])
 app.include_router(calls.router,     dependencies=[Depends(require_service_or_firebase_token)])
 app.include_router(tokens.router,    dependencies=[Depends(require_service_or_firebase_token)])
 app.include_router(incidents.router, dependencies=[Depends(require_service_or_firebase_token)])