Add rename show functionality: implement API endpoint for renaming shows, update Show model to support name changes, and enhance ShowMetadataCard UI for name input. Update translations for new UI elements to improve user experience.

backend/src/TeleWave.Application/Library/RenameShow/RenameShowCommandValidator.cs

@@ -0,0 +1,11 @@
+using FluentValidation;
+
+namespace TeleWave.Application.Library.RenameShow;
+
+public sealed class RenameShowCommandValidator : AbstractValidator<RenameShowCommand>
+{
+    public RenameShowCommandValidator()
+    {
+        RuleFor(x => x.Name).NotEmpty().MaximumLength(256);
+    }
+}