Tuner v1: HLS pipeline with playback/ingest modes

FFmpeg -> MediaMTX -> HLS relay with runtime-configurable modes:
- PLAYBACK_MODE: standard (mpegts), fmp4 (HEVC), llhls
- INGEST_MODE: rtmp, rtsp
- INGEST_AUDIO_MODE: aac, copy
- Hourly playlist auto-refresh from upstream URL
- Fullscreen video UI with collapsible sidebar, upstream-down banner
- Same-origin HLS proxy for HTTPS deployments

Tagged as the last HLS-based version before the mpegts.js (v2) rework.

Dockerfile

@@ -26,6 +26,15 @@ COPY mediamtx.yml /app/mediamtx.yml
 
 ENV RESTREAMER_PORT=8080
 ENV PLAYLIST_PATH=/data/playlist.m3u
+ENV PLAYLIST_URL=https://pia.cx/m3u/630xhAmY/smp424GL
+ENV PLAYLIST_USE_LOCAL=false
+ENV PLAYLIST_AUTO_REFRESH_INTERVAL=1h
+# Playback mode: "standard" (MPEG-TS, iOS-friendly), "fmp4" (HEVC/H.265), or "llhls"
+ENV PLAYBACK_MODE=standard
+# Ingest mode: "rtmp" (default) or "rtsp" (better for HEVC/H.265)
+ENV INGEST_MODE=rtmp
+# RTSP ingest audio mode: "aac" (transcode audio, recommended) or "copy"
+ENV INGEST_AUDIO_MODE=aac
 ENV MEDIAMTX_PATH=/usr/local/bin/mediamtx
 ENV MEDIAMTX_CONFIG=/app/mediamtx.yml
 ENV FRONTEND_DIR=/app/frontend/dist