feat: add fuel:archive command and monthly scheduler entry

Completes Tasks 12 + 13 from docs/superpowers/plans/2026-04-03-fuel-api-ingestion.md.

- ArchiveOldPricesCommand moves station_prices rows older than 12 months
  into station_prices_archive in chunks of 1000, wrapping each chunk's
  insert + delete in a DB::transaction so a partial failure can't
  duplicate rows.
- StationPriceArchive: add $table = 'station_prices_archive'; without it
  Eloquent infers 'station_price_archives' and the insert would fail.
- routes/console.php: register fuel:archive monthly on the 1st at 04:00
  UTC, alongside the other fuel/oil scheduler entries.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

routes/console.php

@@ -33,6 +33,14 @@ Schedule::command('oil:predict --fetch')
     ->onOneServer()
     ->runInBackground();
 
+// Move station_prices rows older than 12 months into station_prices_archive
+// once a month. Keeps the partitioned hot table bounded.
+Schedule::command('fuel:archive')
+    ->monthlyOn(1, '04:00')
+    ->withoutOverlapping()
+    ->onOneServer()
+    ->runInBackground();
+
 // Scheduled WhatsApp updates — morning and evening
 Schedule::job(new SendScheduledWhatsAppJob('morning'))->dailyAt('07:30')->onOneServer();
 Schedule::job(new SendScheduledWhatsAppJob('evening'))->dailyAt('18:00')->onOneServer();