fix(backend): give track titles room to breathe

Titles were capped at 50 characters and the YouTube provisioner silently cut
them there, which mangles anything with a feature or a remix suffix. Albums
are about to make that far more visible, so the column now holds 200.

backend/Musify.Domain/Entities/Track.cs

@@ -11,11 +11,11 @@ namespace Musify.Domain.Entities
         public Guid Id { get; set; } = Guid.NewGuid();
 
         [Required]
-        [MaxLength(50)]
+        [MaxLength(200)]
         public required string Title { get; set; }
 
         [Required]
-        [MaxLength(50)]
+        [MaxLength(200)]
         public required string NormalizedTitle { get; set; }
 
         [Required]