fix(B27): gate warn notify on real Telegram delivery (V66a) + scan config.env bind

VOTE ULANG SEGERA never reached community channel though dashboard badge showed:
- scan service lacked NFS config.env bind -> empty TELEGRAM_* -> send_text silent no-op
- _notify_warn still record_notify'd -> fake dedup rows blocked future sends

send_text/notify_warn now return delivery bool; record_notify only on True.
scan service mounts config.env:/app/.env:ro.

get_voters.py

@@ -210,8 +210,7 @@ def _notify_warn(now):
         if prev is not None and prev >= urgency:
             continue
         to_notify.append((owner, f'{staked:,.4f}', urgency))
-    if to_notify:
-        telegram.notify_warn(to_notify)
+    if to_notify and telegram.notify_warn(to_notify):
         for owner, _, urgency in to_notify:
             db.record_notify(owner, urgency,
                              now.isoformat(timespec='seconds'))