Wire up a web manifest, service worker and icon routes so the player can
be installed on mobile. The static manifest stays generic; the page
regenerates it at runtime from STATION_NAME so an instance keeps its name.
The service worker only caches the app shell, never the live stream or the
playback APIs. Icons (192/512, maskable and apple-touch) are rasterized
from the favicon.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
