feat(documents) : add DocumentType enum and type column on entity

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Enum/DocumentType.php

@@ -0,0 +1,15 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Enum;
+
+enum DocumentType: string
+{
+    case DOCUMENTATION = 'documentation';
+    case DEVIS         = 'devis';
+    case FACTURE       = 'facture';
+    case PLAN          = 'plan';
+    case PHOTO         = 'photo';
+    case AUTRE         = 'autre';
+}