fix: UTC-naive timestamps in distribute/db audit trail (V65)

distribute.py created_at, db.py updated_at/claim_fee now use
datetime.now(timezone.utc).replace(tzinfo=None) to match V62 scan stamps
and eliminate WIB (UTC+7) drift in payment/claim records.

distribute.py

@@ -15,7 +15,7 @@ beri node/Hyperion waktu mengejar indeks + meratakan beban broadcast.
 
 import sys
 import time
-from datetime import datetime
+from datetime import datetime, timezone
 from decimal import Decimal, ROUND_FLOOR, InvalidOperation
 
 import requests
@@ -275,7 +275,7 @@ def run_distribution(dry_run=False):
     total_share = sum(share for _, share in shares)
     telegram.notify_start(run_date, len(shares), total_share, balance)
 
-    created_at = datetime.now().isoformat(timespec='seconds')
+    created_at = datetime.now(timezone.utc).replace(tzinfo=None).isoformat(timespec='seconds')
     total_stake = sum(float(s) for _, s in voters)
     run_id = db.record_run(run_date, float(balance), len(voters), total_stake,
                            0.0, 'ok', created_at)