Get OpenAPI schema

Get the comprehensive, auto-generated OpenAPI spec for all Fiber APIs. Note: This file is very large, so we don't recommend feeding it into LLMs directly. Agents should instead fetch /llms.txt for routing instructions and /ai-docs/<operationId>.md for per-operation context. If you'd like to work with Fiber from Claude, ChatGPT, or another LLM, you can also use our MCP server, explained at https://docs.fiber.ai/article/using-mcp-in-llms.