REFACTOR: change build tool (#4)

Author: T-K-233

berkeley_humanoid_lite_assets/__init__.py

@@ -1,3 +1 @@
-# Copyright (c) 2025, The Berkeley Humanoid Lite Project Developers.
-
 from .berkeley_humanoid_lite import *

berkeley_humanoid_lite_assets/robots/__init__.py

@@ -1,7 +1,3 @@
-[build-system]
-requires = ["setuptools>=61.0"]
-build-backend = "setuptools.build_meta"
-
 [project]
 name = "berkeley_humanoid_lite_assets"
 version = "2025.05.28"
@@ -21,15 +17,14 @@ keywords = ["robotics", "isaaclab"]
 classifiers = [
     "Natural Language :: English",
     "Programming Language :: Python :: 3.10",
-    "Isaac Sim :: 4.5.0",
-]
-dependencies = [
-    "psutil",
 ]
 
 [project.urls]
 repository = "https://github.com/HybridRobotics/Berkeley-Humanoid-Lite-Assets"
 
-[tool.setuptools]
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
 packages = ["berkeley_humanoid_lite_assets"]
-zip-safe = false