feat(p2p): implement OKX-style internal ledger escrow system

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Phase 5 implementation - Internal Ledger Escrow (OKX Model):
- No blockchain transactions during P2P trades
- Blockchain tx only at deposit/withdraw
- Fast and fee-free P2P trading

Database:
- Add user_internal_balances table
- Add p2p_deposit_withdraw_requests table
- Add p2p_balance_transactions table
- Add lock_escrow_internal(), release_escrow_internal() functions
- Add process_deposit(), request_withdraw() functions

UI Components:
- Add InternalBalanceCard showing available/locked balances
- Add DepositModal for crypto deposits to P2P balance
- Add WithdrawModal for withdrawals from P2P balance
- Integrate balance card into P2PDashboard

Backend:
- Add process-withdrawal Edge Function
- Add verify-deposit Edge Function

Updated p2p-fiat.ts:
- createFiatOffer() uses internal balance lock
- confirmPaymentReceived() uses internal balance transfer
- Add internal balance management functions

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Kurdistan Tech Ministry

2025-12-12 00:41:11 +03:00

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commit 14f5e84d15

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