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/Policies/ReviewPolicy.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace App\Policies;
+
+use App\Models\Game;
+use App\Models\Review;
+use App\Models\User;
+
+class ReviewPolicy
+{
+    public function create(User $user, Game $game): bool
+    {
+        return $user->library()->where('game_id', $game->id)->exists();
+    }
+
+    public function update(User $user, Review $review): bool
+    {
+        return $user->id === $review->user_id;
+    }
+
+    public function delete(User $user, Review $review): bool
+    {
+        return $user->id === $review->user_id;
+    }
+}