refactor: standardize market filenames by data dimension

Split market pair logic into spot and futures files and rename price files to plural data-dimension names without changing behavior.

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

internal/data/market/futures_pairs.go

@@ -0,0 +1,65 @@
+package market
+
+import (
+	"context"
+	"strings"
+	"time"
+
+	"github.com/rs/zerolog/log"
+)
+
+func (ms *MarketData) refreshFuturePairCache() error {
+	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
+	defer cancel()
+
+	futuresInfo, err := ms.futuresClient.NewExchangeInfoService().Do(ctx)
+	if err != nil {
+		log.Error().Err(err).Msg("Failed to fetch futures exchange info")
+		return err
+	}
+
+	futurePairs := make(map[string]bool, len(futuresInfo.Symbols))
+	futureTokenCandidates := make(map[string][]string)
+	for _, s := range futuresInfo.Symbols {
+		if s.Status != "TRADING" {
+			continue
+		}
+		futurePairs[s.Symbol] = true
+		token := parseTokenFromSymbolByQuotePriority(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)
+	}
+
+	ms.pairCacheMutex.Lock()
+	ms.futuresPairs = futurePairs
+	ms.futureToken2Symbol = futureToken2Symbol
+	ms.lastPairCacheUpdate = time.Now()
+	ms.pairCacheMutex.Unlock()
+
+	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()
+	return ms.futuresPairs[symbol]
+}
+
+func (ms *MarketData) GetFutureSymbolByToken(token string) (string, bool) {
+	ms.pairCacheMutex.RLock()
+	defer ms.pairCacheMutex.RUnlock()
+	sym, ok := ms.futureToken2Symbol[strings.ToUpper(token)]
+	return sym, ok
+}