feat: order sync for multiple exchanges and position tracking improvements

- Add order sync support for Binance, Hyperliquid, Bybit, OKX, Bitget, Aster exchanges
- Fix weighted average exit price calculation for partial closes
- Handle position flip (翻仓) scenarios correctly
- Fix symbol normalization (ETH vs ETHUSDT)
- Skip order recording for exchanges with OrderSync to avoid duplicates
- Add chart timezone localization

trader/position_snapshot.go

@@ -3,6 +3,7 @@ package trader
 import (
 	"fmt"
 	"nofx/logger"
+	"nofx/market"
 	"nofx/store"
 	"time"
 )
@@ -44,7 +45,8 @@ func CreatePositionSnapshot(traderID, exchangeID, exchangeType string, trader Tr
 
 	for _, posMap := range positions {
 		// Parse position data
-		symbol, _ := posMap["symbol"].(string)
+		rawSymbol, _ := posMap["symbol"].(string)
+		symbol := market.Normalize(rawSymbol)
 		sideStr, _ := posMap["side"].(string)
 		positionAmt, _ := posMap["positionAmt"].(float64)
 		entryPrice, _ := posMap["entryPrice"].(float64)