feat: add explicit content filter for Deezer tracks (#22)

octo-fiesta/Models/SubsonicSettings.cs

@@ -1,6 +1,36 @@
-namespace octo_fiesta.Models;
-
-public class SubsonicSettings
-{
-        public string? Url { get; set; }
+namespace octo_fiesta.Models;
+
+/// <summary>
+/// Explicit content filter mode for Deezer tracks
+/// </summary>
+public enum ExplicitFilter
+{
+    /// <summary>
+    /// Show all tracks (no filtering)
+    /// </summary>
+    All,
+    
+    /// <summary>
+    /// Exclude clean/edited versions (explicit_content_lyrics == 3)
+    /// Shows original explicit content and naturally clean content
+    /// </summary>
+    ExplicitOnly,
+    
+    /// <summary>
+    /// Only show clean content (explicit_content_lyrics == 0 or 3)
+    /// Excludes tracks with explicit_content_lyrics == 1
+    /// </summary>
+    CleanOnly
+}
+
+public class SubsonicSettings
+{
+    public string? Url { get; set; }
+    
+    /// <summary>
+    /// Explicit content filter mode (default: All)
+    /// Environment variable: EXPLICIT_FILTER
+    /// Values: "All", "ExplicitOnly", "CleanOnly"
+    /// </summary>
+    public ExplicitFilter ExplicitFilter { get; set; } = ExplicitFilter.All;
 }