Account locked despite positive balance ($9.15) - unlocking mechanism bug

## Problem My account (aispedsve@gmail.com) is locked with error: ``` {"detail": "User is locked. Reason: Exhausted balance. Top up your balance at fal.ai/dashboard/billing."} ``` However, my dashboard shows **$9.15** balance after topping up $10. ## Steps to reproduce 1. Balance hit $0 → account locked (expected) 2. Topped up $10 via credit card (Mastercard ending 9658) 3. Dashboard shows $9.15 balance 4. Created new admin API key 5. API still returns 403 "User is locked" ## Expected behavior Account should auto-unlock after balance becomes positive. ## Similar issue This appears to be the same unlocking mechanism bug as #489, which was manually resolved by the fal.ai team. Please unlock my account. Thank you.