Fix client/vehicle inline creation and labor catalog visibility

- Migration: make clients.phone nullable (was NOT NULL, broke inline create)
- Vehicle createOptionUsing: use Get callback instead of $livewire->data
  to reliably get client_id in the vehicle inline form
- Remove plate->required() on inline vehicle form (not required in DB)
- Rename 'Norme-ore' → 'Catalog manopere'/'Каталог работ' in navigation
  so users can find the labor catalog easily

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lang/ro/nav.php

@@ -51,7 +51,7 @@ return [
         'Jurnal activitate' => 'Jurnal activitate',
         'KPI mecanici' => 'KPI mecanici',
         'Lucrări terți' => 'Lucrări terți',
-        'Norme-ore' => 'Norme-ore',
+        'Norme-ore' => 'Catalog manopere',
         'Pipeline' => 'Pipeline',
         'Pipeline (tabel)' => 'Pipeline (tabel)',
         'Planuri' => 'Planuri',