build: embed generated asset pack files

hytale-adapter/build.gradle.kts

@@ -28,6 +28,11 @@ val fanModJar = tasks.register<Jar>("fanModJar") {
     duplicatesStrategy = DuplicatesStrategy.EXCLUDE
 
     from(sourceSets.main.get().output)
+    // Keep generated Blockbench exports at their content-declared paths so an
+    // embedded Hytale asset pack can resolve `assets/fan/...` references.
+    from(rootProject.layout.projectDirectory.dir("assets")) {
+        into("assets")
+    }
     from({
         configurations.runtimeClasspath.get()
             .filter { it.exists() }