Refactor EventRelation, EventGroup, and EventFight classes: ensure database operations are enclosed in useDb, add default values for group points, and override delete methods. Update Gradle build script to include lombok dependencies.

Signed-off-by: Chaoscaot <max@maxsp.de>

buildSrc/src/steamwar.kotlin.gradle

@@ -64,4 +64,11 @@ sourceSets {
             exclude("**/*.java", "**/*.kt")
         }
     }
+}
+
+dependencies {
+    annotationProcessor libs.lombok
+    compileOnly libs.lombok
+    testCompileOnly libs.lombok
+    testAnnotationProcessor libs.lombok
 }