Commit Needle production dist and nginx-only Docker image

- Track Needle/MenuScene/dist and Needle/SampleScene/dist for container deploys
- Dockerfile copies pre-built dist (no npm in image); rebuild with npm run build before commit
- Fix Needle .gitignore: /assets/ so dist/assets is not ignored
- Git LFS: track *.wasm; relax .dockerignore so dist is sent as build context

Made-with: Cursor

Needle/MenuScene/.gitignore

@@ -1,7 +1,7 @@
 **/node_modules
-assets/
+# Only ignore exported Unity assets at project root, not dist/assets/
+/assets/
 src/generated/
-dist/
 include/draco/
 include/ktx2/
 include/three/