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/Models/WorkspaceUser.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Models;
+
+use App\Enums\WorkspaceUserRole;
+use Illuminate\Database\Eloquent\Relations\Pivot;
+
+class WorkspaceUser extends Pivot
+{
+    /**
+     * The table associated with the model.
+     *
+     * @var string
+     */
+    protected $table = 'workspace_user';
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var list<string>
+     */
+    protected $fillable = [
+        'role',
+    ];
+
+    /**
+     * Get the attributes that should be cast.
+     *
+     * @return array<string, string>
+     */
+    protected function casts(): array
+    {
+        return [
+            'role' => WorkspaceUserRole::class,
+        ];
+    }
+}