Fix generation JSON/Lyria errors, add Winamp player, and ship Echoes of the Sahel.

Harden DeepSeek JSON parsing with retry, pre-sanitize Lyria prompts, and instrumental fallback. Add pure HTML Winamp skin at /winamp with playlist export support.

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

tests/test_dj.py

@@ -0,0 +1,25 @@
+import json
+
+import pytest
+
+from ozan_radio.dj import parse_llm_json
+
+
+def test_parse_llm_json_plain():
+    data = parse_llm_json('{"title": "Test", "lyria_prompt": "one line"}')
+    assert data["title"] == "Test"
+
+
+def test_parse_llm_json_fenced():
+    raw = '```json\n{"title": "Fenced"}\n```'
+    assert parse_llm_json(raw)["title"] == "Fenced"
+
+
+def test_parse_llm_json_wrapped_text():
+    raw = 'Here is the plan:\n{"title": "Wrapped", "mood": "calm"}\nThanks.'
+    assert parse_llm_json(raw)["title"] == "Wrapped"
+
+
+def test_parse_llm_json_invalid_raises():
+    with pytest.raises(json.JSONDecodeError):
+        parse_llm_json("not json at all")