fix: preserve futures token identity in canonical cache

Keep futureToken2Symbol keyed by raw futures token and use explicit spot-to-future alias mapping during resolver fallback lookups.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/configs/binance/asset.go

@@ -15,3 +15,7 @@ var QuotePriority = []string{"USDT", "USDC", "FDUSD"}
 var FutureToken2SpotTokenMap = map[string]string{
 	"LUNA2": "LUNA",
 }
+
+var SpotToken2FutureTokenMap = map[string]string{
+	"LUNA": "LUNA2",
+}

internal/data/market/trading_pairs.go

@@ -69,7 +69,7 @@ func (ms *MarketData) refreshFuturePairCache() error {
 		if token == "" {
 			continue
 		}
-		token = normalizeFutureToken(token)
+		token = futureCacheTokenKey(token)
 		futureTokenCandidates[token] = append(futureTokenCandidates[token], s.Symbol)
 	}
 
@@ -168,12 +168,8 @@ func selectCanonicalSymbolByQuotePriority(token string, candidates []string) str
 	return normalized[0]
 }
 
-func normalizeFutureToken(token string) string {
-	token = strings.ToUpper(token)
-	if mapped, ok := binance.FutureToken2SpotTokenMap[token]; ok {
-		return strings.ToUpper(mapped)
-	}
-	return token
+func futureCacheTokenKey(token string) string {
+	return strings.ToUpper(token)
 }
 
 func (ms *MarketData) IsSpotPair(symbol string) bool {

internal/data/market/trading_pairs_test.go

@@ -26,15 +26,15 @@ func TestSelectCanonicalSymbolByQuotePriority_NoPreferredQuote(t *testing.T) {
 	}
 }
 
-func TestNormalizeFutureToken_AppliesOverride(t *testing.T) {
-	got := normalizeFutureToken("LUNA2")
-	if got != "LUNA" {
-		t.Fatalf("expected LUNA, got %q", got)
+func TestFutureCacheTokenKey_PreservesRawFutureToken(t *testing.T) {
+	got := futureCacheTokenKey("LUNA2")
+	if got != "LUNA2" {
+		t.Fatalf("expected LUNA2, got %q", got)
 	}
 }
 
-func TestNormalizeFutureToken_NoOverride(t *testing.T) {
-	got := normalizeFutureToken("PEPE")
+func TestFutureCacheTokenKey_NoOverride(t *testing.T) {
+	got := futureCacheTokenKey("PEPE")
 	if got != "PEPE" {
 		t.Fatalf("expected PEPE, got %q", got)
 	}

internal/helper/binancex/resolver.go

@@ -18,10 +18,7 @@ func Token2FutureSymbols(token string) []string {
 		return []string{mapped}
 	}
 
-	for futureToken, spotToken := range binance.FutureToken2SpotTokenMap {
-		if strings.ToUpper(spotToken) != token {
-			continue
-		}
+	if futureToken, ok := binance.SpotToken2FutureTokenMap[token]; ok {
 		if mapped, ok := data.Market.GetFutureSymbolByToken(strings.ToUpper(futureToken)); ok {
 			return []string{mapped}
 		}