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/field.field.node.ligne_comptable.field_montant_ht.yml

@@ -0,0 +1,23 @@
+uuid: 01f65184-8cc7-48d7-a886-f2163e724c07
+langcode: en
+status: true
+dependencies:
+  config:
+    - field.storage.node.field_montant_ht
+    - node.type.ligne_comptable
+id: node.ligne_comptable.field_montant_ht
+field_name: field_montant_ht
+entity_type: node
+bundle: ligne_comptable
+label: 'Montant HT (€)'
+description: ''
+required: true
+translatable: true
+default_value: {  }
+default_value_callback: ''
+settings:
+  min: null
+  max: null
+  prefix: ''
+  suffix: ''
+field_type: decimal