fix: update CORS configuration to allow additional frontend origins

Added 'http://localhost:5174' and 'http://localhost:5175' to the allowed origins in the CORS configuration, enabling support for multiple frontend development ports.

Author: tokechan

backend/config/cors.php

@@ -3,7 +3,7 @@
 return [
     'paths' => ['api/*'],
     'allowed_methods' => ['*'],
-    'allowed_origins' => ['http://localhost:5173'], // フロントエンドのURL
+    'allowed_origins' => ['http://localhost:5173', 'http://localhost:5174', 'http://localhost:5175'], // フロントエンドのURL（Viteは利用可能なポートを自動選択）
     'allowed_origins_patterns' => [],
     'allowed_headers' => ['*'],
     'exposed_headers' => [],