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>

web/modules/custom/figli_compta_ledger/src/Controller/DashboardController.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Drupal\figli_compta_ledger\Controller;
+
+use Drupal\Core\Controller\ControllerBase;
+
+/**
+ * Renders the JS-driven ledger dashboard (progressive decoupling: Drupal
+ * serves the page shell + auth via the session cookie, dashboard.js fetches
+ * JSON:API and does all the aggregation client-side).
+ */
+class DashboardController extends ControllerBase {
+
+  public function view() {
+    return [
+      '#theme' => 'figli_compta_dashboard',
+      '#attached' => [
+        'library' => ['figli_compta_ledger/dashboard'],
+      ],
+    ];
+  }
+
+}