Connect a customer-supplied MCP server (static creds or OAuth)

curl --request POST \
  --url https://api-sandbox.featherhq.com/v1/integrations/connections/custom-mcp \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "nickname": "<string>",
  "server_url": "<string>",
  "transport": "sse",
  "auth_type": "none",
  "token": "<string>",
  "api_key": "<string>",
  "api_key_header": "X-API-Key",
  "headers": {},
  "oauth_authorize_url": "<string>",
  "oauth_token_url": "<string>",
  "oauth_client_id": "<string>",
  "oauth_client_secret": "<string>",
  "oauth_scopes": [
    "<string>"
  ]
}
'

{
  "connection_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "status": "<string>",
  "vendor": "<string>",
  "authorize_url": "<string>",
  "state": "<string>"
}