Changes to Create an OpenRouter chat completion

request body became required

the messages request property's minItems was increased to 1

api operation id openRouterGateway_openrouter_native_chat_completions removed and replaced with openrouter_native_chat_completions

api tag OpenRouter Gateway added

api tag openRouterGateway removed

added the media type text/event-stream for the response with the status 200

added the non-success response with the status 403

removed the non-success response with the status 401

deleted the header request parameter Authorization

the endpoint scheme security RespanApiKey was added to the API

api operation id openrouter-native-chat-completions removed and replaced with openRouterGateway_openrouter_native_chat_completions