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/Models/UserListGame.php

@@ -3,8 +3,12 @@
 namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
 class UserListGame extends Model
 {
-    //
+    protected $fillable = ['user_list_id', 'game_id', 'order', 'notes'];
+
+    public function list(): BelongsTo { return $this->belongsTo(UserList::class, 'user_list_id'); }
+    public function game(): BelongsTo { return $this->belongsTo(Game::class); }
 }