feat(mic): add runtime-configurable microphone pins to brucePins.conf - #2319
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Closes BruceDevices#2281 - Add an I2SPins struct and a mic_bus member to BruceConfigPins, defaulting to the board's PIN_CLK/PIN_DATA (falling back to "no pin" on boards that don't define them), matching the existing bus-config convention used by i2c_bus, gps_bus, CC1101_bus, etc. - Serialize/deserialize mic_bus as a nested "Mic_Pins" object in brucePins.conf - Add a single setMicPins(I2SPins) setter that saves the config once - Add a "Mic Pins" menu entry in Dev Mode for CLK and DATA pin selection, mirroring the shared pin-picker menus (setI2CPinsMenu/setUARTPinsMenu) - Update mic.cpp to read pins from bruceConfigPins.mic_bus at runtime instead of using compile-time macros directly
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Summary
micClkandmicDatafields toBruceConfigPins, defaulting to the board's compile-timePIN_CLK/PIN_DATAvalues/brucePins.confJSONmic.cppto read pins frombruceConfigPinsat runtime instead of compile-time macrosCloses #2281
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