feat: OIDC 로그인 연동 및 DB 스키마 업데이트

kngil/auth/oidc-login.php

@@ -0,0 +1,20 @@
+<?php
+// /kngil/auth/oidc-login.php
+require_once dirname(__DIR__) . '/vendor/autoload.php';
+$config = require_once dirname(__DIR__) . '/bbs/oidc_config.php';
+
+use Jumbojett\OpenIDConnectClient;
+
+$oidc = new OpenIDConnectClient(
+    $config['issuer'],
+    $config['client_id'],
+    $config['client_secret']
+);
+
+$oidc->setRedirectURL($config['redirect_url']);
+$oidc->addScope($config['scopes']);
+
+// 필요한 경우 PKCE 활성화
+// $oidc->setCodeChallengeMethod('S256');
+
+$oidc->authenticate();