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/system.site.yml

@@ -0,0 +1,15 @@
+_core:
+  default_config_hash: ijfbzDTN4CbE7Sr-6ubWzy_t1vH4OtU1doNCLssVz-4
+langcode: en
+uuid: 771fd453-fb55-4eb0-bbc9-52fa9697d2b8
+name: 'Figures Libres - Compta'
+mail: admin@example.com
+slogan: ''
+page:
+  403: ''
+  404: ''
+  front: /node
+admin_compact_mode: false
+weight_select_max: 100
+default_langcode: en
+mail_notification: null