Add reviews, search autocomplete, SEO meta/schema, user lists

- Review system: ReviewController (store/update/destroy), ReviewPolicy, Review model boot() hooks, review form with Alpine.js (spoiler toggle, edit/delete UX)
- Search autocomplete: Alpine.js searchWidget in nav with 300ms debounce, keyboard navigation, 6-result dropdown
- SEO: og:image, twitter:card in layout; og sections + Schema.org VideoGame JSON-LD on game show pages
- Custom lists: UserList/UserListGame models, ListController, ListPolicy, lists index/show views, Add-to-List button on game pages

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

app/Providers/AppServiceProvider.php

@@ -23,5 +23,7 @@ class AppServiceProvider extends ServiceProvider
     public function boot(): void
     {
         Gate::policy(UserGame::class, UserGamePolicy::class);
+        Gate::policy(\App\Models\Review::class, \App\Policies\ReviewPolicy::class);
+        Gate::policy(\App\Models\UserList::class, \App\Policies\ListPolicy::class);
     }
 }