build: add numpy-stl + Open3DModel config block for find_model

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -8,6 +8,7 @@ dependencies = [
     "uvicorn[standard]>=0.27.0",
     "httpx>=0.27.0",
     "numpy>=1.24.0",
+    "numpy-stl>=3.1.0",
     "opencv-contrib-python-headless>=4.9.0.80",
     "pyyaml>=6.0",
     "pydantic>=2.5.0",