Alpha token prices are now looked up directly from Alpha data instead
of being cached into spotPrice. Remove unused ensureAlphaCacheLoaded
and shouldRefreshAlphaCache functions.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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>
thuanle
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