feat(en-pages): build remaining 14 pages (Editorial / Forms / Hubs / Legal)

Brings the EN site to 34 live pages, completing the original sitemap
from PDF Strategie & Contenu Partie C.1.

Editorial section (5 pages, page-editorial-detail.php template)
- /why-asterion/, /about/, /customers/, /trust/, /partners/
- inc/editorial-data.php centralizes the copy from D.18-D.21, D.28
- Reuses the industry-detail partial (same section schema)

Conversion section (4 pages, page-conversion-form.php template)
- /request-demo/, /request-te-kit/, /request-quote/, /contact/
- inc/forms-data.php declares fields per page (text/email/select/textarea)
- template-parts/conversion-form.php renders two-column layout
  (form left, promise right), eligibility list (T&E), FAQ (Demo)
- inc/form-handler.php: nonce-protected POST handler with honeypot,
  per-field sanitizer, wp_mail to AV_LEADS_RECIPIENT (defaults to
  jerome.foucher@asterionvr.com, override via wp-config.php define),
  redirect-back-with-status pattern.

Insights & Resources (page-insights-hub.php, page-resources.php)
- /insights/ queries `post`, falls back to placeholder when empty
- /resources/ lists 4 resource groups (datasheets, whitepapers,
  videos, brochures) per D.23

Legal (page-legal.php template, parent + 4 children)
- /legal/, /legal/privacy/, /legal/terms/, /legal/cookies/, /legal/notice/
- Renders page content if filled, falls back to slug-driven section
  skeleton (per D.29) for counsel to draft against.

All 16 new URLs verified HTTP 200, sizes 49-66 KB each. Mu-plugin
asterion-seed-rest.php in LocalWP self-deleted after seeding.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

wp-content/themes/asterion-bricks/functions.php

@@ -99,8 +99,9 @@ add_action('wp_head', function () {
  * Each file is opt-in via file_exists() so partial scaffolds don't fatal.
  */
 $av_includes = [
-    'inc/cpt.php', // Custom post types: case_study, scenario.
-    'inc/seo.php', // Schema.org JSON-LD overrides.
+    'inc/cpt.php',          // Custom post types: case_study, scenario.
+    'inc/seo.php',          // Schema.org JSON-LD overrides.
+    'inc/form-handler.php', // Conversion form POST handler.
 ];
 
 foreach ($av_includes as $av_include) {