Add song library with Git LFS, DJ chat, and tinqs/live-radio publish path.

Songs persist under songs/ (MP3 via LFS, metadata in git). Player shows saved library.

Co-authored-by: Cursor <cursoragent@cursor.com>

songs/README.md

@@ -0,0 +1,18 @@
+# Song library
+
+Every generated track is saved here:
+
+| File | Git | Contents |
+|------|-----|----------|
+| `{id}_{title}.mp3` | **LFS** | Audio (~2 MB per track) |
+| `{id}.meta.json` | plain git | Title, mood, DJ line, Lyria prompt, lyrics, timestamp |
+| `manifest.json` | plain git | Queue index |
+
+**Clone with LFS:**
+
+```bash
+git lfs install
+git clone git@ssh.tinqs.com:tinqs/live-radio.git
+```
+
+Friends get the same saved songs after pull. New generations are committed the same way — `*.mp3` via LFS, metadata as normal files.