feat: L'Ami Fiduciaire V1.0.0 — full codebase with Story 0.1 complete

Initial commit of the L'Ami Fiduciaire SaaS platform built on Laravel 12,
Vue 3, Inertia.js 2, and Tailwind CSS 4.

Story 0.1 (rename folders to declarations in database) is implemented and
code-reviewed: migration, rollback, and 6 Pest tests all passing.

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

app/Enums/FolderStatus.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Enums;
+
+use BenSampo\Enum\Enum;
+
+final class FolderStatus extends Enum
+{
+    const Draft = 'draft';
+
+    const WaitingDocuments = 'waiting_documents';
+
+    const DocumentsReceived = 'documents_received';
+
+    const Processing = 'processing';
+
+    const AdditionalDocumentsRequested = 'additional_documents_requested';
+
+    const WaitingClientValidation = 'waiting_client_validation';
+
+    const Validated = 'validated';
+
+    const Closed = 'closed';
+
+    const Cancelled = 'cancelled';
+}