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* fix(exchange): widen MEXC recvWindow to 60s and retry on 700003
MEXC round-trip latency from the API egress has a heavy tail (p99 ~5s,
outliers >60s). Signed requests carried no recvWindow, so MEXC's 5s
default rejected slow calls with error 700003 ("Timestamp for this
request is outside of the recvWindow"), failing liquidity-management
pipelines (e.g. the XMR deficit rule) before any order was placed.
Set recvWindow to the MEXC maximum (60s) on both the ccxt client options
and the custom signed REST path, and retry the custom path once with a
fresh timestamp on 700003.
* refactor(exchange): source MEXC recvWindow from a single config value
Avoid duplicating the 60000 literal across the ccxt options and the
custom signed REST path by reading both from Config.mexcRecvWindow.
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