fix: remove HL-delisted coins from scanner (BNT/CATI/CYBER/ILV/LISTA/OGN/STG) + PIXEL

Root cause: HL WS uses allMids (all coins), BG WS subscribes per-coin.
Delisted coins had stale HL prices showing huge fake spreads (~200%).
Monitor tried entry → BG buy succeeds, HL sell fails (Trading is halted)
→ orphan position on BG accumulated across restarts.

Fix:
- Set HL="" for BNT, CATI, CYBER, ILV, LISTA, OGN, STG, PIXEL
- Add guard in ScanBGHL to skip coins where BG or HL is empty
- Same guard in SpreadWindowTracker.Tick

scanner.go

@@ -51,13 +51,13 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "BIO", BN: "", BG: "BIOUSDT", HL: "BIO"},
 	{Name: "BLUR", BN: "", BG: "BLURUSDT", HL: "BLUR"},
 	{Name: "BNB", BN: "", BG: "BNBUSDT", HL: "BNB"},
-	{Name: "BNT", BN: "", BG: "BNTUSDT", HL: "BNT"},
+	{Name: "BNT", BN: "", BG: "BNTUSDT", HL: ""},
 	{Name: "BOME", BN: "", BG: "BOMEUSDT", HL: "BOME"},
 	{Name: "BRETT", BN: "", BG: "BRETTUSDT", HL: "BRETT"},
 	{Name: "BSV", BN: "", BG: "BSVUSDT", HL: "BSV"},
 	{Name: "BTC", BN: "", BG: "BTCUSDT", HL: "BTC"},
 	{Name: "CAKE", BN: "", BG: "CAKEUSDT", HL: "CAKE"},
-	{Name: "CATI", BN: "", BG: "CATIUSDT", HL: "CATI"},
+	{Name: "CATI", BN: "", BG: "CATIUSDT", HL: ""},
 	{Name: "CC", BN: "", BG: "CCUSDT", HL: "CC"},
 	{Name: "CELO", BN: "", BG: "CELOUSDT", HL: "CELO"},
 	{Name: "CFX", BN: "", BG: "CFXUSDT", HL: "CFX"},
@@ -65,7 +65,7 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "CHIP", BN: "", BG: "CHIPUSDT", HL: "CHIP"},
 	{Name: "COMP", BN: "", BG: "COMPUSDT", HL: "COMP"},
 	{Name: "CRV", BN: "", BG: "CRVUSDT", HL: "CRV"},
-	{Name: "CYBER", BN: "", BG: "CYBERUSDT", HL: "CYBER"},
+	{Name: "CYBER", BN: "", BG: "CYBERUSDT", HL: ""},
 	{Name: "DASH", BN: "", BG: "DASHUSDT", HL: "DASH"},
 	{Name: "DOOD", BN: "", BG: "DOODUSDT", HL: "DOOD"},
 	{Name: "DOT", BN: "", BG: "DOTUSDT", HL: "DOT"},
@@ -92,7 +92,7 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "HYPE", BN: "", BG: "HYPEUSDT", HL: "HYPE"},
 	{Name: "HYPER", BN: "", BG: "HYPERUSDT", HL: "HYPER"},
 	{Name: "ICP", BN: "", BG: "ICPUSDT", HL: "ICP"},
-	{Name: "ILV", BN: "", BG: "ILVUSDT", HL: "ILV"},
+	{Name: "ILV", BN: "", BG: "ILVUSDT", HL: ""},
 	{Name: "IMX", BN: "", BG: "IMXUSDT", HL: "IMX"},
 	{Name: "INIT", BN: "", BG: "INITUSDT", HL: "INIT"},
 	{Name: "INJ", BN: "", BG: "INJUSDT", HL: "INJ"},
@@ -106,7 +106,7 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "LAYER", BN: "", BG: "LAYERUSDT", HL: "LAYER"},
 	{Name: "LDO", BN: "", BG: "LDOUSDT", HL: "LDO"},
 	{Name: "LINEA", BN: "", BG: "LINEAUSDT", HL: "LINEA"},
-	{Name: "LISTA", BN: "", BG: "LISTAUSDT", HL: "LISTA"},
+	{Name: "LISTA", BN: "", BG: "LISTAUSDT", HL: ""},
 	{Name: "LIT", BN: "", BG: "LITUSDT", HL: "LIT"},
 	{Name: "LTC", BN: "", BG: "LTCUSDT", HL: "LTC"},
 	{Name: "MANTA", BN: "", BG: "MANTAUSDT", HL: "MANTA"},
@@ -128,13 +128,13 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "NIL", BN: "", BG: "NILUSDT", HL: "NIL"},
 	{Name: "NOT", BN: "", BG: "NOTUSDT", HL: "NOT"},
 	{Name: "NXPC", BN: "", BG: "NXPCUSDT", HL: "NXPC"},
-	{Name: "OGN", BN: "", BG: "OGNUSDT", HL: "OGN"},
+	{Name: "OGN", BN: "", BG: "OGNUSDT", HL: ""},
 	{Name: "ORDI", BN: "", BG: "ORDIUSDT", HL: "ORDI"},
 	{Name: "PAXG", BN: "", BG: "PAXGUSDT", HL: "PAXG"},
 	{Name: "PENDLE", BN: "", BG: "PENDLEUSDT", HL: "PENDLE"},
 	{Name: "PENGU", BN: "", BG: "PENGUUSDT", HL: "PENGU"},
 	{Name: "PEOPLE", BN: "", BG: "PEOPLEUSDT", HL: "PEOPLE"},
-	{Name: "PIXEL", BN: "", BG: "PIXELUSDT", HL: "PIXEL"},
+	{Name: "PIXEL", BN: "", BG: "PIXELUSDT", HL: ""},
 	{Name: "PNUT", BN: "", BG: "PNUTUSDT", HL: "PNUT"},
 	{Name: "POL", BN: "", BG: "POLUSDT", HL: "POL"},
 	{Name: "POLYX", BN: "", BG: "POLYXUSDT", HL: "POLYX"},
@@ -159,7 +159,7 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "SPX", BN: "", BG: "SPXUSDT", HL: "SPX"},
 	{Name: "STABLE", BN: "", BG: "STABLEUSDT", HL: "STABLE"},
 	{Name: "STBL", BN: "", BG: "STBLUSDT", HL: "STBL"},
-	{Name: "STG", BN: "", BG: "STGUSDT", HL: "STG"},
+	{Name: "STG", BN: "", BG: "STGUSDT", HL: ""},
 	{Name: "STRK", BN: "", BG: "STRKUSDT", HL: "STRK"},
 	{Name: "STX", BN: "", BG: "STXUSDT", HL: "STX"},
 	{Name: "SUI", BN: "", BG: "SUIUSDT", HL: "SUI"},
@@ -219,6 +219,9 @@ func ScanBGHL(snap map[string]map[string]float64) []*ArbOpportunity {
 	var results []*ArbOpportunity
 
 	for _, coin := range TrackedCoins {
+		if coin.BG == "" || coin.HL == "" {
+			continue // skip coins not available on both exchanges
+		}
 		exMap := snap[coin.Name]
 		if exMap == nil {
 			continue