Remove comments from backend and web-player source

Strip //, /* */ and XML doc comments from all backend .cs files, and
JS/TS/CSS/HTML comments from web-player source (.ts, .svelte, .css),
per the project's no-comments convention.

backend/Core/Musify.Infrastructure/Persistence/AuditableEntityInterceptor.cs

@@ -24,11 +24,6 @@ namespace Musify.Infrastructure.Persistence
             if (context == null)
                 return;
 
-            // SavingChanges(Async) fires before EF's own automatic change detection for this
-            // save, so entities modified through plain property assignment (query, then set a
-            // property, then SaveChanges — the normal case) still show as Unchanged here unless
-            // something already forced detection. Force it explicitly, otherwise UpdatedAt is
-            // never bumped on a real update, only on inserts.
             context.ChangeTracker.DetectChanges();
 
             var now = DateTime.UtcNow;