Initial Drupal site: content model + validation + Vue dashboard

- Content type "Ligne comptable" with Paragraphs "Répartition" (Compte + Montant)
- Taxonomies: Compte (9 comptes) and Client (unified client list)
- hook_node_presave + form validate: sum(répartition) must equal montant HT
- /dashboard route (progressive decoupling): Vue 3 app fetching JSON:API,
  computing solde par compte / par client client-side
- "Ajouter une ligne" opens the real Drupal node form in an AJAX modal
- Gin as default + admin theme
- 9 opening-balance lines seeded from suivi_compta_SASFigli2026_v2.ods

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

config/sync/image.style.medium.yml

@@ -0,0 +1,23 @@
+uuid: 2ecf71bc-4a3c-43e9-b76b-5a612d6be321
+langcode: en
+status: true
+dependencies: {  }
+_core:
+  default_config_hash: aUG-EM9kKTKhcsdttoYmG5tug7pU2mNOQzcpp91jfFQ
+name: medium
+label: 'Medium (220×220)'
+effects:
+  bddf0d06-42f9-4c75-a700-a33cafa25ea0:
+    uuid: bddf0d06-42f9-4c75-a700-a33cafa25ea0
+    id: image_scale
+    weight: 0
+    data:
+      width: 220
+      height: 220
+      upscale: false
+  c410ed2f-aa30-4d9c-a224-d2865d9188cd:
+    uuid: c410ed2f-aa30-4d9c-a224-d2865d9188cd
+    id: image_convert_avif
+    weight: 2
+    data:
+      extension: webp