Fix concurrent map read/write race condition in MarketData

Add sync.RWMutex to protect future and spot price maps accessed by
WebSocket handlers (writers) and Telegram bot handlers (readers).
Also adds Alpha token support with caching.

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

internal/data/market/spot_price.go

@@ -1,14 +1,35 @@
 package market
 
 import (
+	"strconv"
+
 	"github.com/adshao/go-binance/v2"
 	"github.com/rs/zerolog/log"
-	"strconv"
 )
 
 func (ms *MarketData) GetSpotPrice(symbol string) (float64, bool) {
+	ms.mu.RLock()
 	p, ok := ms.spotPrice[symbol]
-	return p, ok
+	ms.mu.RUnlock()
+	if ok {
+		return p, true
+	}
+
+	// If not found, check if it's an Alpha token and ensure cache is loaded
+	ms.ensureAlphaCacheLoaded()
+	if ms.IsAlphaToken(symbol) {
+		if alphaToken, exists := ms.GetAlphaToken(symbol); exists {
+			price := alphaToken.GetPrice()
+			if price > 0 {
+				ms.mu.Lock()
+				ms.spotPrice[symbol] = price
+				ms.mu.Unlock()
+				return price, true
+			}
+		}
+	}
+
+	return 0, false
 }
 
 func (ms *MarketData) StartSpotWsMarkPrice() error {
@@ -21,6 +42,8 @@ func (ms *MarketData) StartSpotWsMarkPrice() error {
 }
 
 func (ms *MarketData) spotWsAllMarketsStatHandler(event binance.WsAllMarketsStatEvent) {
+	ms.mu.Lock()
+	defer ms.mu.Unlock()
 	for _, priceEvent := range event {
 		price, err := strconv.ParseFloat(priceEvent.LastPrice, 64)
 		if err != nil {