chore: ignore media library runtime data, keep directory via .gitkeep

.gitignore

@@ -8,3 +8,7 @@ certs/
 .venv-tests/
 __pycache__/
 .pytest_cache/
+
+# Permanent music library (media server runtime data)
+/media/*
+!/media/.gitkeep

media/jobs/477f760d9615.json

@@ -1 +0,0 @@
-{"id": "477f760d9615", "track_id": "qATbf5-D8bU", "stage": "ready", "progress": 100.0, "error": null, "started_at": 1788023839.0112658}

media/jobs/7436101dd688.json

@@ -1 +0,0 @@
-{"id": "7436101dd688", "track_id": "LWtRNwbmlb4", "stage": "ready", "progress": 100.0, "error": null, "started_at": 1788023614.9862244}

media/jobs/d1aab72f3953.json

@@ -1 +0,0 @@
-{"id": "d1aab72f3953", "track_id": "hR7xhDhDGR0", "stage": "error", "progress": 0.0, "error": "ERROR: [youtube] hR7xhDhDGR0: This video is unavailable", "started_at": 1788023758.6851313}

media/library.json

@@ -1 +0,0 @@
-{"tracks": {}, "version": 42}