Files
DinQuant/backend_api_python/app/services
TIANHE e5bb37bcbb fix: Improve decimal precision handling across all exchange clients
- Add strict_precision parameter to _dec_str methods
- Modify quantity normalization methods to return (Decimal, precision) tuple
- Infer precision from stepSize/lotSz/qtyStep for accurate formatting
- Update all order placement methods to use precision information
- Fix LOT_SIZE filter errors by strictly limiting decimal places

Affected exchanges:
- Binance Spot & Futures
- OKX
- Bybit
- Bitget Spot & Futures
- Deepcoin

This ensures order quantities are formatted with correct precision matching exchange requirements.
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