feat: Add some improvments

src/proxy.c

@@ -710,7 +710,11 @@ void proxy_cleanup() {
 void handle_signal(int sig) {
     if (sig == SIGINT) {
         printf("\nShutting down proxy server...\n");
+        printf("Cleaning up temporary certificates...\n");
+        
+        // Clean up DANE resources (which will delete all generated certificates)
         proxy_cleanup();
+        
         exit(0);
     }
 }