0.2.0 Multi currency support

• /history endpoint enhancements: Added support for countback parameter to limit the number of candles returned. Introduced dynamic scaling for price and volume values based on configurable decimals per symbol.

• /search endpoint implementation: Enables user-friendly symbol lookups with support for filters (query, type, exchange, limit).

• Improved TradingPairConfig: Added decimals field to allow per-symbol precision settings.

• Minor optimizations and logging improvements for debugging.