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/block.block.olivero_help.yml

@@ -0,0 +1,22 @@
+uuid: f67abf35-d194-4acd-b9b0-24991835ee6a
+langcode: en
+status: true
+dependencies:
+  module:
+    - help
+  theme:
+    - olivero
+_core:
+  default_config_hash: VfPFqqxfkomud5CO8DUijw85QIl9GIxh_nIxLOYESxg
+id: olivero_help
+theme: olivero
+region: content_above
+weight: 0
+provider: null
+plugin: help_block
+settings:
+  id: help_block
+  label: Help
+  label_display: '0'
+  provider: help
+visibility: {  }