refactor: tighten project structure and strengthen tooling

src/utils/debug/scene/DebugHelpers.tsx

@@ -0,0 +1,19 @@
+import { Debug } from "@/utils/debug/Debug";
+
+export function DebugHelpers(): React.JSX.Element | null {
+  const debug = Debug.getInstance();
+
+  if (!debug.active) {
+    return null;
+  }
+
+  return (
+    <>
+      <gridHelper
+        args={[180, 36, "#1d4ed8", "#1e293b"]}
+        position={[0, 0.01, 0]}
+      />
+      <axesHelper args={[10]} />
+    </>
+  );
+}