docs: add OpenAI Response API content (#9588)

* docs: add OpenAI Response API content

Added documentation for the OpenAI Response API, detailing its features and resources for developers.

* docs: update video title for OpenAI Response API

src/data/roadmaps/ai-engineer/content/openai-response-api@xXLyuUNrKEc32XLQxMjgT.md

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+# OpenAI Response API
+
+The OpenAI Response API provides a unified, flexible interface for generating model outputs across text, vision, audio, and tool-augmented workflows. It replaces and generalizes earlier completion-style APIs by allowing developers to send structured input and receive rich, multi-part responses, including model reasoning, tool calls, and streamed outputs.
+
+This API is designed for building agents and applications that need conversational state, multimodal inputs, structured outputs, and tight integration with tools such as function calling, retrieval, and external services.
+
+Visit the following resources to learn more:
+
+- [@official@Response API Reference](https://platform.openai.com/docs/api-reference/responses)
+- [@video@Build Hour: Responses API](https://www.youtube.com/watch?v=hNr5EebepYs)