fix: add pyproject.toml for openenv validate

pyproject.yaml

@@ -0,0 +1,24 @@
+[build-system]
+requires = ["setuptools>=68.0", "wheel"]
+build-backend = "setuptools.backends.legacy:build"
+
+[project]
+name = "cdn-cache-optimizer"
+version = "1.0.0"
+description = "Edge CDN Cache Optimizer - OpenEnv RL Environment"
+requires-python = ">=3.11"
+dependencies = [
+    "fastapi==0.111.0",
+    "uvicorn==0.29.0",
+    "pydantic==2.7.1",
+    "openai==1.30.1",
+    "requests==2.31.0",
+    "python-multipart==0.0.9",
+]
+
+[project.optional-dependencies]
+dev = ["pytest", "httpx"]
+
+[tool.setuptools.packages.find]
+where = ["."]
+include = ["env*", "api*"]