SEO fixes: robots.txt, canonicals, noindex, og tags, breadcrumbs, similar games, review schema

- robots.txt: proper Disallow rules + sitemap URL
- Layout: robots meta tag, fix canonical syntax, og:site_name, full Twitter Card tags
- Game pages: canonical URLs, og:type website, breadcrumb nav + JSON-LD schema
- Screenshot alt text with game title and index
- VideoGame JSON-LD: review array with rating/author/body
- Similar Games section on game detail (by genre, ordered by rating)
- browse/index: noindex on paginated or multi-filter pages
- search results: noindex + improved title
- User library and lists: noindex
- Unique meta descriptions on browse, top-rated, new-releases pages

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

app/Http/Controllers/GameController.php

@@ -39,7 +39,10 @@ class GameController extends Controller
         $genres   = Genre::orderBy('name')->get();
         $platforms = Platform::orderBy('name')->get();
 
-        return view('games.index', compact('games', 'genres', 'platforms'));
+        $shouldNoindex = ($request->get('page', 1) > 1) ||
+            (collect(['genre', 'platform', 'year', 'sort', 'q'])->filter(fn($k) => $request->filled($k))->count() >= 2);
+
+        return view('games.index', compact('games', 'genres', 'platforms', 'shouldNoindex'));
     }
 
     public function show(Game $game)
@@ -61,7 +64,18 @@ class GameController extends Controller
             ->limit(20)
             ->get();
 
-        $response = view('games.show', compact('game', 'userGame', 'userReview', 'userLists', 'comments'));
+        $similarGames = collect();
+        if ($game->genres->isNotEmpty()) {
+            $similarGames = Game::published()
+                ->whereHas('genres', fn($q) => $q->whereIn('genres.id', $game->genres->pluck('id')))
+                ->where('id', '!=', $game->id)
+                ->where('rating_count', '>=', 1)
+                ->orderByDesc('rating_avg')
+                ->limit(6)
+                ->get();
+        }
+
+        $response = view('games.show', compact('game', 'userGame', 'userReview', 'userLists', 'comments', 'similarGames'));
         return auth()->check()
             ? $response
             : response($response)->header('Cache-Control', 'public, max-age=300');