Streaming Demo

HLS https://cloud.bakkaz.name.ng/bakkaz-assets/streaming-service/hls/01989ea6-80f9-70be-94ed-612e2ff20813/master.m3u8 Quality:

Update `.env` with `CDN_BASE_URL` and `DEMO_HLS_MANIFEST_PATH` (or set `DEMO_HLS_MANIFEST` to a full URL). The demo falls back to a public Mux test stream.