bnair123 7d63e43b7b Add data layer (DuckDB storage, fetcher) and spot adapter with tests ...

- Add DataStorage class for DuckDB-based market data persistence
- Add DataFetcher for historical candle backfill and sync operations
- Add BinanceSpotAdapter for spot wallet balance queries
- Add binance_spot_base_url to Settings for spot testnet support
- Add comprehensive unit tests (50 new tests, 82 total)
- Coverage increased from 62% to 86%

2025-12-27 14:38:26 +04:00

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