docs: update development documentation with new make targets
refactor: simplify audio quality presets implementation
style: remove redundant comments and align error handling
chore: add lint-ui-fix target to Makefile
- Add new /system/memory endpoint to expose total system memory
- Implement process metrics collection for audio and microphone processes
- Update UI to display real-time process metrics with charts
- Replace environment variable check with CLI flag for audio input server
- Improve audio metrics broadcasting with 1-second intervals
- Add memory usage capping for CPU percentage metrics