fix: CORS preflight OPTIONS 요청 허용

Author: heeseon-aicx

src/main/java/be/dash/dashserver/api/support/PermissionInterceptor.java

@@ -28,6 +28,10 @@ public class PermissionInterceptor implements HandlerInterceptor {
 
     @Override
     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
+        // CORS preflight 요청은 통과
+        if ("OPTIONS".equalsIgnoreCase(request.getMethod())) {
+            return true;
+        }
         if (handler instanceof ResourceHttpRequestHandler)
             return true;
         HandlerMethod method = (HandlerMethod) handler;