renamed SearchResponse to ServiceItem and moved to shared package

backend/src/main/java/com/vaessl/app/shared/ServiceItem.java

@@ -0,0 +1,18 @@
+package com.vaessl.app.shared;
+
+import java.util.Map;
+import jakarta.validation.constraints.NotNull;
+
+public record ServiceItem(String id, @NotNull String title, String description,
+        Map<String, Object> extraData) {
+
+    public String getExtra(String key) {
+        if (extraData == null) {
+            return null;
+        } else {
+            Object value = extraData.get(key);
+
+            return value != null ? String.valueOf(value) : null;
+        }
+    }
+}