fix(back-end): file error handling

backend/src/main/resources/application.properties

@@ -22,4 +22,5 @@ spring.servlet.multipart.max-request-size=200MB
 # ClamAV Configuration
 clamav.host=${CLAMAV_HOST:clamav}
 clamav.port=${CLAMAV_PORT:3310}
+clamav.enabled=${CLAMAV_ENABLED:false}
 

backend/src/test/java/com/printcalculator/config/TestConfig.java

@@ -13,7 +13,7 @@ public class TestConfig {
     @Bean
     @Primary
     public ClamAVService mockClamAVService() {
-        return new ClamAVService("localhost", 3310) {
+        return new ClamAVService("localhost", 3310, true) {
             @Override
             public boolean scan(InputStream inputStream) {
                 return true; // Always clean for tests