Add recipe versioning: auto-bump on change, history sub-page

Each time the recipe name or spices are changed on the product edit
page, a new version is created instead of overwriting the current one.
Unchanged saves are skipped. A 'Rezept-Versionen' button opens a
sub-page (/produkt/{id}/rezept-versionen) listing all versions with
their spices and timestamps; the active version is highlighted in green.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

resources/views/filament/user/resources/product-resource/pages/recipe-history.blade.php

@@ -0,0 +1,3 @@
+<x-filament-panels::page>
+    {{ $this->table }}
+</x-filament-panels::page>