fix: anvil_transfer_pricing upsert 시 updated_at 갱신

ON CONFLICT 절에 updated_at = CURRENT_TIMESTAMP 추가

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/repositories/anvil-transfer-pricing.ts

@@ -58,7 +58,8 @@ export class AnvilTransferPricingRepository extends BaseRepository<AnvilTransfer
           ) VALUES (?, ?)
           ON CONFLICT(anvil_region_id)
           DO UPDATE SET
-            price_per_gb = excluded.price_per_gb`
+            price_per_gb = excluded.price_per_gb,
+            updated_at = CURRENT_TIMESTAMP`
         ).bind(
           price.anvil_region_id,
           price.price_per_gb