feat(butter): add EVisibility enum, Maintainer access level, and SystemUploaderId setting

Butter/Settings/Settings.cs

@@ -31,7 +31,9 @@ public enum Settings {
     /// <summary>Quality setting (1–100) for WebP thumbnail encoding.</summary>
     ThumbnailQuality,
     /// <summary>Quality setting (1–100) for WebP preview encoding.</summary>
-    PreviewQuality
+    PreviewQuality,
+    /// <summary>User ID used for scanner-created asset attribution.</summary>
+    SystemUploaderId
 }
 
 /// <summary>
@@ -59,6 +61,7 @@ public static class SettingsExtensions {
             Settings.JobBatchSize           => "Job Batch Size",
             Settings.ThumbnailQuality       => "Thumbnail Quality",
             Settings.PreviewQuality         => "Preview Quality",
+            Settings.SystemUploaderId       => "System Uploader Id",
             _                                => setting.ToString() // Fallback to the enum name
         };
     }

Butter/Types/EAccessLevel.cs

@@ -5,9 +5,11 @@ namespace Butter.Types;
 /// </summary>
 public enum EAccessLevel {
     /// <summary>Standard user with basic permissions.</summary>
-    User,
+    User = 0,
+    /// <summary>Maintainer — scoped cosplayer management and tag management.</summary>
+    Maintainer = 1,
     /// <summary>Curator with elevated permissions for managing assets.</summary>
-    Curator,
+    Curator = 2,
     /// <summary>Administrator with full system access.</summary>
-    Admin
+    Admin = 3
 }

Butter/Types/EVisibility.cs

@@ -0,0 +1,13 @@
+namespace Butter.Types;
+
+/// <summary>
+/// Defines visibility levels for entities in the system.
+/// </summary>
+public enum EVisibility {
+    /// <summary>Visible to everyone, including anonymous users.</summary>
+    Public = 0,
+    /// <summary>Visible to authenticated users only.</summary>
+    Protected = 1,
+    /// <summary>Visible only to authorized users (maintainers, curators, admins).</summary>
+    Private = 2
+}