fix: restore canonical token lookup for market caches

internal/data/market/futures_pairs.go

@@ -25,17 +25,16 @@ func (ms *MarketData) refreshFuturePairCache() error {
 			continue
 		}
 		futurePairs[s.Symbol] = true
-		token := parseTokenFromSymbolByQuotePriority(s.Symbol)
+		token := tokenKeyFromSymbol(s.Symbol)
 		if token == "" {
 			continue
 		}
-		token = futureCacheTokenKey(token)
 		futureTokenCandidates[token] = append(futureTokenCandidates[token], s.Symbol)
 	}
 
 	futureToken2Symbol := make(map[string]string, len(futureTokenCandidates))
 	for token, candidates := range futureTokenCandidates {
-		futureToken2Symbol[token] = selectCanonicalSymbolByQuotePriority(token, candidates)
+		futureToken2Symbol[token] = selectCanonicalFutureSymbol(token, candidates)
 	}
 
 	ms.pairCacheMutex.Lock()
@@ -47,10 +46,6 @@ func (ms *MarketData) refreshFuturePairCache() error {
 	return nil
 }
 
-func futureCacheTokenKey(token string) string {
-	return strings.ToUpper(token)
-}
-
 func (ms *MarketData) IsFuturesPair(symbol string) bool {
 	ms.pairCacheMutex.RLock()
 	defer ms.pairCacheMutex.RUnlock()