Add uv project configuration and fix dependencies

- Add pyproject.toml for uv package management with all required dependencies
- Add .gitignore to exclude .env, __pycache__, and virtual environments
- Add python-dotenv for environment variable management
- Remove unused langchain_teddynote.messages import from app.py
- Load .env file automatically in graph.py for OPENAI_API_KEY

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,44 @@
+# Environment variables
+.env
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# Virtual environments
+.venv/
+venv/
+ENV/
+env/
+
+# uv
+uv.lock
+
+# IDEs
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db

app.py

@@ -2,7 +2,6 @@ import gradio as gr
 import time
 from gradio import ChatMessage
 from langchain_core.runnables import RunnableConfig
-from langchain_teddynote.messages import random_uuid
 from langchain_core.messages import BaseMessage, HumanMessage
 from pprint import pprint
 from graph import app as workflow

graph.py

@@ -1,7 +1,11 @@
+from dotenv import load_dotenv
 from langchain_openai import ChatOpenAI
 from langgraph_supervisor import create_supervisor
 from langgraph.prebuilt import create_react_agent
 
+# Load environment variables from .env file
+load_dotenv()
+
 model = ChatOpenAI(model="gpt-4o")
 
 # Create specialized agents

pyproject.toml

@@ -0,0 +1,24 @@
+[project]
+name = "langgraph-ui"
+version = "0.1.0"
+description = "LangGraph UI with Gradio interface"
+readme = "README.md"
+requires-python = ">=3.10"
+dependencies = [
+    "langgraph",
+    "langchain-openai",
+    "langgraph-supervisor",
+    "langchain-teddynote",
+    "gradio>=5.41.0",
+    "python-dotenv",
+]
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[tool.hatch.build.targets.wheel]
+packages = ["."]
+
+[tool.uv]
+dev-dependencies = []