plano/demos/use_cases/multi_frameworks/gateway_test.rest

### Test weather agent via Plano gateway
POST http://localhost:8001/v1/chat/completions
Content-Type: application/json

{
  "model": "gpt-4o",
  "messages": [
    {"role": "user", "content": "What's the weather in Seattle today?"}
  ]
}

### Test flight agent via Plano gateway
POST http://localhost:8001/v1/chat/completions
Content-Type: application/json

{
  "model": "gpt-4o",
  "messages": [
    {"role": "user", "content": "Find flights from Seattle to New York"}
  ]
}