Fix double-prefixed media URLs in API responses

Media->url accessor already returns full URL via Storage::url().
Remove redundant asset('storage/') wrapping.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/Http/Controllers/Api/V1/AcademyController.php

@@ -27,7 +27,7 @@ public function news(Request $request): JsonResponse
                 'title' => $item->title,
                 'excerpt' => $item->excerpt,
                 'category' => $item->category,
-                'image_url' => $item->image?->url ? asset('storage/' . $item->image->url) : null,
+                'image_url' => $item->image?->url ? $item->image->url : null,
                 'published_at' => $item->published_at?->toIso8601String(),
                 'is_featured' => $item->is_featured,
             ]),
@@ -54,7 +54,7 @@ public function newsShow(string $uuid): JsonResponse
                 'title' => $article->title,
                 'body' => $article->body,
                 'category' => $article->category,
-                'image_url' => $article->image?->url ? asset('storage/' . $article->image->url) : null,
+                'image_url' => $article->image?->url ? $article->image->url : null,
                 'published_at' => $article->published_at?->toIso8601String(),
             ],
         ]);
@@ -104,7 +104,7 @@ public function events(): JsonResponse
                 'starts_at' => $e->starts_at?->toIso8601String(),
                 'ends_at' => $e->ends_at?->toIso8601String(),
                 'location_name' => $e->location_name,
-                'cover_url' => $e->cover?->url ? asset('storage/' . $e->cover->url) : null,
+                'cover_url' => $e->cover?->url ? $e->cover->url : null,
                 'max_capacity' => $e->max_capacity,
                 'registrations_count' => $e->registrations_count,
                 'is_registration_open' => $e->isRegistrationOpen(),
@@ -128,7 +128,7 @@ public function gallery(): JsonResponse
         return response()->json([
             'data' => $media->map(fn ($m) => [
                 'id' => $m->id,
-                'url' => $m->url ? asset('storage/' . $m->url) : null,
+                'url' => $m->url ? $m->url : null,
                 'caption' => $m->caption,
                 'type' => $m->type,
                 'created_at' => $m->created_at?->toIso8601String(),