feat: add multi-exchange order sync and position tracking

- Add order sync implementations for Hyperliquid, Bybit, OKX, Bitget, Aster
- Add position snapshot functionality for exchange position reset
- Update TraderOrder and TraderFill structures with exchange_type field
- Add exchange sync tests
- Update frontend charts components
- Remove deprecated position_sync.go

main.go

@@ -11,7 +11,6 @@ import (
 	"nofx/manager"
 	"nofx/mcp"
 	"nofx/store"
-	"nofx/trader"
 	"os"
 	"os/signal"
 	"path/filepath"
@@ -115,11 +114,6 @@ func main() {
 		logger.Warnf("⚠️ Failed to restore backtest history: %v", err)
 	}
 
-	// Start position sync manager (detects manual closures, TP/SL triggers)
-	positionSyncManager := trader.NewPositionSyncManager(st, 0) // 0 = use default 10s interval
-	positionSyncManager.Start()
-	defer positionSyncManager.Stop()
-
 	// Load all traders from database to memory (may auto-start traders with IsRunning=true)
 	if err := traderManager.LoadTradersFromStore(st); err != nil {
 		logger.Fatalf("❌ Failed to load traders: %v", err)