jacob-meacham / rotary-voip / 26375244030

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fix(gpio): use gpio_claim_alert so edge callbacks actually fire

lgpio.callback() silently does nothing on pins claimed via
gpio_claim_input (at least with lgpio 0.2.2 on Trixie's 6.x kernel).
Confirmed by isolation test: gpio_claim_input + callback = no events,
gpio_claim_alert + callback = events fire correctly. The libgpiod tools
(gpiomon) work because they use a different kernel interface.

Switching all input pins to gpio_claim_alert with BOTH_EDGES — alert
claims still support gpio_read, so no functionality is lost.

This was why off-hook/pickup detection wasn't working in service mode
even though gpioget showed the pin transitioning correctly.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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