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/article.json.php

@@ -1,21 +1,21 @@
 <?php
 
-$related = $page->related_articles()->toPages();
+$related = $page->relatedArticles()->toPages();
 if ($related->isEmpty()) {
   $related = $page->siblings()->listed()->not($page)->shuffle()->limit(3);
 }
 
 $specificData = [
   'date' => $page->date()->toDate('Y-m-d'),
-  'date_formatted' => $page->date()->toDate('d/m/Y'),
+  'dateFormatted' => $page->date()->toDate('d/m/Y'),
   'intro' => $page->intro()->value(),
   'author' => [
-    'name' => $page->author_name()->value(),
-    'role' => $page->author_role()->value(),
-    'photo' => $page->author_photo()->toFile()?->url()
+    'name' => $page->authorName()->value(),
+    'role' => $page->authorRole()->value(),
+    'photo' => $page->authorPhoto()->toFile()?->url()
   ],
   'cover' => $page->cover()->toFile()?->url(),
-  'content' => $page->article_content()->toBlocks(),
+  'content' => $page->articleContent()->toBlocks(),
   'tags' => $page->tags()->split(),
   'related' => $related->map(function($rec) {
     return [
@@ -25,7 +25,7 @@ $specificData = [
       'cover' => $rec->cover()->toFile()?->thumb(['width' => 400])->url()
     ];
   })->values(),
-  'parent_url' => $page->parent()->url()
+  'parentUrl' => $page->parent()->url()
 ];
 
 $pageData = array_merge($genericData, $specificData);