Fix OpenEnv validator: add uv.lock, server entry point, openenv-core dep

pyproject.toml

@@ -10,4 +10,8 @@ dependencies = [
     "requests>=2.31.0",
     "openai>=1.30.0",
     "python-dotenv>=1.0.0",
+    "openenv-core>=0.2.0",
 ]
+
+[project.scripts]
+server = "server.app:main"

server/app.py

@@ -1,6 +1,15 @@
 """
-Root-level server/app.py — re-exports the FastAPI app from email_env.
-This file exists to satisfy the OpenEnv validator convention.
+Root-level server/app.py — re-exports the FastAPI app from email_env
+and provides a main() entry point for OpenEnv validator.
 """
 
+import uvicorn
 from email_env.server.app import app  # noqa: F401
+
+
+def main():
+    uvicorn.run(app, host="0.0.0.0", port=7860)
+
+
+if __name__ == "__main__":
+    main()