Add now-playing view with metadata polling, six-band EQ controls, full REST coverage, companion-chip badges, and gzip-www helper for the embedded setup page. Co-authored-by: Cursor <cursoragent@cursor.com>
Introduces Si4684/ADAU1701 drivers, TunerService, FrequencyKHz, SeekDirection, /api/tuner routes without file-scope globals, host tests, and firmware blob tooling (binaries remain gitignored). Co-authored-by: Cursor <cursoragent@cursor.com>