feat: add User model and users migration

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

app/Models/User.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Foundation\Auth\User as Authenticatable;
+use Illuminate\Notifications\Notifiable;
+use Spatie\Permission\Traits\HasRoles;
+
+class User extends Authenticatable
+{
+    use HasRoles, Notifiable;
+
+    protected $fillable = ['name', 'email', 'password'];
+
+    protected $hidden = ['password', 'remember_token'];
+
+    protected $casts = ['password' => 'hashed'];
+}