feat: add Agents UI to proprietary right sidebar (#6454)

Update UI to include agents

Run `task dev:all` to test

app/core/src/main/java/stirling/software/SPDF/controller/api/misc/ConfigController.java

@@ -307,6 +307,9 @@ public class ConfigController {
             // Premium/Enterprise settings
             configData.put("premiumEnabled", applicationProperties.getPremium().isEnabled());
 
+            // AI Engine settings
+            configData.put("aiEngineEnabled", applicationProperties.getAiEngine().isEnabled());
+
             // Timestamp TSA settings — single source of truth for presets + admin URLs
             ApplicationProperties.Security.Timestamp tsConfig =
                     applicationProperties.getSecurity().getTimestamp();