Alpaca券商金额精度

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@user_3c6cb52e/alpaca-broker-money-precision

Handle money and numeric precision correctly with the Alpaca API — numbers-as-strings on the wire, decimals vs floats, rounding/truncation before sending amounts, fractional-share precision, and safe DB storage. Use when handling monetary amounts, order quantities, or prices in any Alpaca integration in any language.