copy user entity and auth from ysv

backend/app/Auth/BcryptPasswordHasher.php

@@ -0,0 +1,16 @@
+<?php
+
+namespace App\Auth;
+
+class BcryptPasswordHasher implements PasswordHasher
+{
+    public function hash(string $password): string
+    {
+        return password_hash($password, PASSWORD_DEFAULT);
+    }
+
+    public function verify(string $password, string $hash): bool
+    {
+        return password_verify($password, $hash);
+    }
+}