Milestone 1: Liquidsoap broadcasting skeleton

Liquidsoap (v2.4.5) container that plays the /cache directory in random
order and broadcasts it over HTTP at :8000/radio.mp3 (MP3 192 kbps).
mksafe guarantees a continuous stream (silence when the cache is empty).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

README.md

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+# radieo
+
+A personal music radio: an always-on HTTP audio stream, automatically fed from
+several sources and broadcast with [Liquidsoap](https://www.liquidsoap.info/).
+
+The goal is a hassle-free stream that always has something playing, where the
+next track is picked automatically. It is meant for personal use (a couple of
+simultaneous listeners), not for public broadcasting.
+
+## How it works
+
+radieo is built as two layers, each running in its own Docker container and
+sharing a cache volume:
+
+- **`ingest`** (Python) — the brain. It decides what to play next, resolves and
+  downloads tracks into a local cache, keeps a pre-filled queue, and exposes the
+  next track over HTTP. *(planned — see roadmap below)*
+- **`stream`** (Liquidsoap) — deliberately dumb. It broadcasts the audio over
+  HTTP and never goes silent thanks to a local fallback.
+
+Playback sources (planned): a [Navidrome](https://www.navidrome.org/) library
+via the OpenSubsonic API, arbitrary tracks fetched with
+[yt-dlp](https://github.com/yt-dlp/yt-dlp) (Bandcamp, SoundCloud, YouTube…), and
+listening suggestions from a ListenBrainz RSS feed.
+
+## Usage
+
+Requirements: Docker with Compose v2.
+
+```sh
+# Drop some .mp3 files into the cache directory
+cp /path/to/music/*.mp3 cache/
+
+# Build and start the stream
+docker compose up -d
+
+# Listen (VLC, a browser, any audio player)
+#   http://localhost:8000/radio.mp3
+```
+
+Stop it with `docker compose down`.
+
+The stream is MP3 at 192 kbps. Multiple clients can listen at the same time.
+New files dropped into `cache/` are picked up automatically (the playlist is
+reloaded when the directory changes).
+
+## Current status
+
+**Milestone 1 — broadcasting skeleton: done.**
+
+- Liquidsoap (v2.4.5) container plays the `cache/` directory in random order.
+- HTTP stream served at `http://localhost:8000/radio.mp3` (MP3, 192 kbps).
+- Continuous output guaranteed: silence rather than a crash when the cache is
+  empty (`mksafe`).
+- Multiple simultaneous listeners supported.
+
+At this stage the playlist is filled manually; the automatic ingestion layer is
+not implemented yet.
+
+## Roadmap
+
+1. ✅ **Broadcasting skeleton** — Liquidsoap serving the cache directory.
+2. **Ingestion daemon** — Python daemon exposing `GET /next`; Liquidsoap
+   switches to a `request.dynamic` source with the cache as fallback.
+3. **Navidrome provider** — play from an OpenSubsonic playlist, with caching,
+   LRU retention and play history.
+4. **yt-dlp provider** — fetch tracks from a maintained URL/artist list; weighted
+   mixing between sources.
+5. **Canonicalizer** — ListenBrainz MBID lookup for source-agnostic
+   de-duplication.
+6. **ListenBrainz provider** — parse the RSS suggestions feed and resolve each
+   one to Navidrome or yt-dlp.
+7. **Polish** — crossfade, robustness, optional web player, config file.