fix: Change MarketIndex from uint8_t to int16_t to support spot markets #107
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Fixes elliottech#106 Spot market orders (market_id >= 2048) were incorrectly routed to perps market 0 due to uint8_t overflow. The uint8_t type (max 255) was truncating spot market IDs (2048+) to 0. Updated CreateOrderTxReq struct MarketIndex field from uint8_t to int16_t in Python ctypes definition and all platform header files to match lighter-go sharedlib fix.
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Fixes #106
Spot market orders (market_id >= 2048) were incorrectly routed to perps market 0 due to uint8_t overflow. The uint8_t type (max 255) was truncating spot market IDs (2048+) to 0.
Updated CreateOrderTxReq struct MarketIndex field from uint8_t to int16_t in Python ctypes definition and all platform header files to match lighter-go sharedlib fix.