Refactor: snake_case → camelCase dans blueprints, templates et vues

- Blueprints : renommage des champs (member_name, related_articles,
  background_video, play_links, images_gallery, external_links) et
  des noms de sections
- Templates JSON PHP : clés de sortie et appels ->method() en camelCase
- Vues Svelte (Play, Portfolio) : accès aux données alignés

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

site/templates/project.json.php

@@ -10,10 +10,10 @@ $specificData = [
   'impact' => $page->impact()->split(','),
   'category' => $page->category()->value(),
   'platforms' => $page->platforms()->split(','),
-  'client_name' => $page->client_name()->value(),
-  'apple_link' => $page->apple_link()->value(),
-  'android_link' => $page->android_link()->value(),
-  'web_link' => $page->web_link()->value(),
+  'clientName' => $page->clientName()->value(),
+  'appleLink' => $page->appleLink()->value(),
+  'androidLink' => $page->androidLink()->value(),
+  'webLink' => $page->webLink()->value(),
   'prev' => $page->prev() ? [
     'title' => $page->prev()->title()->value(),
     'url' => $page->prev()->url()
@@ -22,7 +22,7 @@ $specificData = [
     'title' => $page->next()->title()->value(),
     'url' => $page->next()->url()
   ] : null,
-  'parent_url' => $page->parent()->url()
+  'parentUrl' => $page->parent()->url()
 ];
 
 $pageData = array_merge($genericData, $specificData);