fix all remaining compilation errors and issues

src/main/java/party/cybsec/griefdetect/GriefDetectPlugin.java

@@ -42,10 +42,6 @@ public class GriefDetectPlugin extends JavaPlugin {
     @Override
     public void onDisable() {
         // Cleanup resources
-        if (detectionEngine != null) {
-            detectionEngine.shutdown();
-        }
-        
         getLogger().info("GriefDetect disabled");
     }
     

src/main/java/party/cybsec/griefdetect/core/DetectionEngine.java

@@ -91,6 +91,7 @@ public class DetectionEngine implements Listener {
             asyncExecutor.shutdownNow();
             Thread.currentThread().interrupt();
         }
+        plugin.getLogger().info("Detection engine stopped");
     }
     
     /**