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/main.go

@@ -54,3 +54,47 @@ func (ms *MarketData) alphaCacheRefreshLoop() {
 		ms.refreshAlphaTokenCache()
 	}
 }
+
+func (ms *MarketData) refreshTradingPairCache() error {
+	if err := ms.refreshSpotPairCache(); err != nil {
+		return err
+	}
+	if err := ms.refreshFuturePairCache(); err != nil {
+		return err
+	}
+
+	ms.pairCacheMutex.RLock()
+	spotCount := len(ms.spotPairs)
+	futureCount := len(ms.futuresPairs)
+	ms.pairCacheMutex.RUnlock()
+
+	log.Info().
+		Int("spot", spotCount).
+		Int("futures", futureCount).
+		Msg("Trading pair cache refreshed")
+
+	return nil
+}
+
+func (ms *MarketData) cacheRefreshLoop() {
+	ms.refreshAllCaches()
+	ticker := time.NewTicker(time.Hour)
+	defer ticker.Stop()
+	for range ticker.C {
+		ms.refreshAllCaches()
+	}
+}
+
+func (ms *MarketData) refreshAllCaches() {
+	if err := ms.refreshSpotPairCache(); err != nil {
+		log.Error().Err(err).Msg("Failed spot pair refresh")
+	}
+	if err := ms.refreshFuturePairCache(); err != nil {
+		log.Error().Err(err).Msg("Failed futures pair refresh")
+	}
+	ms.refreshAlphaTokenCache()
+}
+
+func (ms *MarketData) RefreshTradingPairCache() error {
+	return ms.refreshTradingPairCache()
+}