Restructure Led as a template on the DT spec, add a generic
signal/slot mechanism for host status, and cache Infrared sensor
samples via trigger callbacks. Add new init modules for LED, temp,
and watchdog, and build them into the main app.
- Remove heating and NTC functionality from communication module
- Convert Infrared from template to runtime array-based implementation
- Refactor Led to support multiple LEDs with compile-time name
validation
- Simplify main to remove direct hardware initialization
- Update west manifest for dr2501a board and add ch9438 module
- Add CONFIG_SAMPLE_NTC to CMakeLists.txt and Kconfig
- Implement PI temperature controller with PWM output in heating.hpp
- Convert NtcGroup from template to non-template class
- Add LED helper class with flash support
- Implement COM protocol handlers for device ID and running state
- Add SPI, sensor, and PWM configuration to prj.conf
- Remove indicator overlay and update main.cpp with temperature
monitoring
- Add test script for serial protocol communication
