Add Music Videos directory setting for Plex music video support

New configurable path for storing music videos separately from audio
files, following Plex's global music video folder convention.

- Settings: library.music_videos_path (default: ./MusicVideos)
- UI: Music Videos Dir field on Settings Downloads tab with lock/unlock
- Docker: /app/MusicVideos volume mount in Dockerfile and docker-compose
- Added 'library' to settings save whitelist (was missing — music_paths
  also wasn't persisting through main settings save)
- No download functionality yet — path infrastructure only

Dockerfile

@@ -35,7 +35,7 @@ COPY . .
 
 # Create necessary directories with proper permissions
 # NOTE: /app/data is for database FILES, /app/database is the Python package
-RUN mkdir -p /app/config /app/data /app/logs /app/downloads /app/Transfer /app/scripts && \
+RUN mkdir -p /app/config /app/data /app/logs /app/downloads /app/Transfer /app/MusicVideos /app/scripts && \
     chown -R soulsync:soulsync /app
 
 # Create defaults directory and copy template files
@@ -47,7 +47,7 @@ RUN mkdir -p /defaults && \
 
 # Create volume mount points
 # NOTE: Changed /app/database to /app/data to avoid overwriting Python package
-VOLUME ["/app/config", "/app/data", "/app/logs", "/app/downloads", "/app/Transfer", "/app/scripts"]
+VOLUME ["/app/config", "/app/data", "/app/logs", "/app/downloads", "/app/Transfer", "/app/MusicVideos", "/app/scripts"]
 
 # Copy and set up entrypoint script
 COPY entrypoint.sh /entrypoint.sh

config/settings.py

@@ -461,7 +461,8 @@ class ConfigManager:
                 "poll_interval": 30
             },
             "library": {
-                "music_paths": []
+                "music_paths": [],
+                "music_videos_path": "./MusicVideos"
             },
             "scripts": {
                 "path": "./scripts",

docker-compose.yml

@@ -30,6 +30,7 @@ services:
       - ./logs:/app/logs
       - ./downloads:/app/downloads
       - ./Staging:/app/Staging
+      - ./MusicVideos:/app/MusicVideos
       - ./scripts:/app/scripts
       # Use named volume for database persistence (separate from host database)
       # NOTE: Changed from /app/database to /app/data to avoid overwriting Python package

web_server.py

@@ -5184,7 +5184,7 @@ def handle_settings():
             if 'active_media_server' in new_settings:
                 config_manager.set_active_media_server(new_settings['active_media_server'])
 
-            for service in ['spotify', 'plex', 'jellyfin', 'navidrome', 'soulseek', 'download_source', 'settings', 'database', 'metadata_enhancement', 'file_organization', 'playlist_sync', 'tidal', 'tidal_download', 'qobuz', 'hifi_download', 'deezer_download', 'listenbrainz', 'acoustid', 'lastfm', 'genius', 'import', 'lossy_copy', 'listening_stats', 'ui_appearance', 'youtube', 'content_filter', 'itunes', 'm3u_export', 'musicbrainz', 'deezer', 'audiodb', 'metadata', 'hydrabase', 'security', 'discogs']:
+            for service in ['spotify', 'plex', 'jellyfin', 'navidrome', 'soulseek', 'download_source', 'settings', 'database', 'metadata_enhancement', 'file_organization', 'playlist_sync', 'tidal', 'tidal_download', 'qobuz', 'hifi_download', 'deezer_download', 'listenbrainz', 'acoustid', 'lastfm', 'genius', 'import', 'lossy_copy', 'listening_stats', 'ui_appearance', 'youtube', 'content_filter', 'itunes', 'm3u_export', 'musicbrainz', 'deezer', 'audiodb', 'metadata', 'hydrabase', 'security', 'discogs', 'library']:
                 if service in new_settings:
                     for key, value in new_settings[service].items():
                         config_manager.set(f'{service}.{key}', value)

webui/index.html

@@ -4595,6 +4595,14 @@
                                     </div>
                                 </div>
 
+                                <div class="form-group">
+                                    <label>Music Videos Dir:</label>
+                                    <div class="path-input-group">
+                                        <input type="text" id="music-videos-path" placeholder="./MusicVideos" readonly>
+                                        <button class="browse-button locked" onclick="togglePathLock('music-videos', this)">Unlock</button>
+                                    </div>
+                                </div>
+
                                 <div class="form-group">
                                     <label>Download Source:</label>
                                     <select id="download-source-mode" class="form-select"

webui/static/script.js

@@ -5899,6 +5899,7 @@ async function loadSettingsData() {
         document.getElementById('download-path').value = settings.soulseek?.download_path || './downloads';
         document.getElementById('transfer-path').value = settings.soulseek?.transfer_path || './Transfer';
         document.getElementById('staging-path').value = settings.import?.staging_path || './Staging';
+        document.getElementById('music-videos-path').value = settings.library?.music_videos_path || './MusicVideos';
 
         // Populate Download Source settings
         document.getElementById('download-source-mode').value = settings.download_source?.mode || 'soulseek';
@@ -7153,7 +7154,8 @@ async function saveSettings(quiet = false) {
             allow_explicit: document.getElementById('allow-explicit').checked
         },
         library: {
-            music_paths: collectMusicPaths()
+            music_paths: collectMusicPaths(),
+            music_videos_path: document.getElementById('music-videos-path').value || './MusicVideos'
         },
         import: {
             replace_lower_quality: document.getElementById('import-replace-lower-quality').checked
@@ -8204,7 +8206,8 @@ async function logoutQobuz() {
 const PATH_INPUT_IDS = {
     download: 'download-path',
     transfer: 'transfer-path',
-    staging:  'staging-path'
+    staging:  'staging-path',
+    'music-videos': 'music-videos-path'
 };
 
 function togglePathLock(pathType, btn) {