feat: add partner system and withdrawal management to cabinet
- Partner application flow: user applies, admin reviews/approves/rejects
- Individual commission % per partner with admin management
- Campaign assignment/unassignment to partners
- Withdrawal system: balance check, create request, cancel
- Admin withdrawal management with risk scoring and fraud analysis
- Database migration: partner_applications table, user partner fields, campaign partner_user_id
- Pydantic schemas with proper validation bounds
- Batch user fetching to prevent N+1 queries
- Row locking on cancel to prevent race conditions
Fringg
58bfaeaddb