fix: 删除STBL, 撤回22002错误修正（22002是Passphrase认证问题）

- 删除 scanner.go 中的 STBL
- 撤回 22002 的'已平仓'处理（该码是API认证错误）
- 保持 closeLeg 报错原样输出

scanner.go

@@ -156,7 +156,6 @@ var TrackedCoins = []TrackedCoin{
 	{Name: "SOPH", BN: "", BG: "SOPHUSDT", HL: "SOPH"},
 	{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: ""},
 	{Name: "STRK", BN: "", BG: "STRKUSDT", HL: "STRK"},
 	{Name: "STX", BN: "", BG: "STXUSDT", HL: "STX"},