# AI Provider: "openai" | "anthropic" | "google"
AI_PROVIDER=openai

# OpenAI
OPENAI_API_KEY=sk-your-key-here
OPENAI_MODEL=gpt-4o

# Anthropic (optional)
ANTHROPIC_API_KEY=sk-ant-your-key-here
ANTHROPIC_MODEL=claude-sonnet-4-20250514

# Google (optional)
GOOGLE_API_KEY=your-google-api-key-here
GOOGLE_MODEL=gemini-2.0-flash

# Server
PORT=3001
CORS_ORIGIN=http://localhost:5173