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.action.node_unpromote_action.yml

@@ -0,0 +1,13 @@
+uuid: a437da46-4243-4538-a345-04cb208414dc
+langcode: en
+status: true
+dependencies:
+  module:
+    - node
+_core:
+  default_config_hash: JBptjnfuOMtsdKygklXxoOgeOCTMtQxlkymjnnj-cC0
+id: node_unpromote_action
+label: 'Remove content from front page'
+type: node
+plugin: node_unpromote_action
+configuration: {  }