Audio capture and streaming app for webOS 5/6

Captures the TV's audio and sends it out over several transports. The
primary one is HyperHDR: RTP/L16 to a host-side loopback device, since
HyperHDR has no network audio input of its own. A second route renders
the spectrum on the TV and sends FlatBuffers images to port 19400
instead, for setups where touching the host's sound config is not an
option.

  native/       the service: capture backends (PulseAudio, ALSA, exec,
                test tone, all dlopen-based), DSP, and one file per sink
  frontend/     D-pad driven UI at a fixed 1920x1080
  servicefiles/ native service manifest plus the boot script
  host/         RTP receiver and the loopback installer for the HyperHDR
                machine
  tools/        build/package, asset generation, Homebrew Channel
                manifest, on-TV probe
  test/         host-side suites: FlatBuffers and RTP verified against
                real decoders, the engine end to end, the page in jsdom

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

frontend/appinfo.json

@@ -0,0 +1,15 @@
+{
+  "id": "org.webosbrew.audiocap",
+  "version": "1.0.0",
+  "vendor": "Homebrew",
+  "type": "web",
+  "main": "index.html",
+  "title": "Audio Cap",
+  "appDescription": "Capture TV audio and stream it to HyperHDR and other receivers",
+  "icon": "assets/icon.png",
+  "largeIcon": "assets/largeIcon.png",
+  "iconColor": "#101820",
+  "splashBackground": "assets/splash.png",
+  "bgImage": "assets/splash.png",
+  "disableBackHistoryAPI": true
+}