Base URL and SDK Migration

OpenAI-Compatible API Migration: Change Base URL to Flatkey

If your app already uses an OpenAI compatible API, moving to Flatkey should not start with a rewrite. The controlled path is smaller: get a Flatkey key, point your OpenAI-compatible SDK at https://router.flatkey.ai/v1, choose a model ID from the Flatkey catalog, and verify the first request in logs,