feat(playlist): enhance public playlist index with hero stats and loading optimizations

Add a redesigned hero section to the public playlist page displaying
community-generated totals for playlists and episodes, plus new string
translations (English, German, French). Eager-load user, limited episode
previews, and first gallery image to reduce N+1 queries. Cache aggregate
statistics for 10 minutes to improve performance on high-traffic pages.

app/Livewire/Playlists.php

@@ -3,6 +3,7 @@
 namespace App\Livewire;
 
 use App\Models\Playlist;
+use Illuminate\Support\Facades\Cache;
 use Livewire\Attributes\Url;
 use Livewire\Component;
 use Livewire\WithPagination;
@@ -54,11 +55,30 @@ class Playlists extends Component
             ->withCount('episodes')
             ->having('episodes_count', '>', 1)
             ->when($this->search != '', fn ($query) => $query->where('name', 'like', '%'.$this->search.'%'))
+            ->with([
+                'user',
+                'episodes' => fn ($query) => $query->orderBy('position')->limit(4),
+                'episodes.episode.gallery' => fn ($query) => $query->limit(1),
+            ])
             ->orderBy($orderby, $orderdirection)
             ->paginate($this->pagination);
 
+        $stats = Cache::remember('publicPlaylistStats', 600, function () {
+            $playlists = Playlist::where('is_private', 0)
+                ->withCount('episodes')
+                ->having('episodes_count', '>', 1)
+                ->get();
+
+            return [
+                'playlists' => $playlists->count(),
+                'episodes' => $playlists->sum('episodes_count'),
+            ];
+        });
+
         return view('livewire.playlists', [
             'playlists' => $playlists,
+            'totalPlaylists' => $stats['playlists'],
+            'totalEpisodes' => $stats['episodes'],
         ]);
     }
 }