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We regularly get bug reports from users who mistakenly have the `OPENAI_BASE_URL` environment variable set. This PR deprecates this environment variable in favor of a top-level config key `openai_base_url` that is used for the same purpose. By making it a config key, it will be more visible to users. It will also participate in all of the infrastructure we've added for layered and managed configs. Summary - introduce the `openai_base_url` top-level config key, update schema/tests, and route the built-in openai provider through it while - fall back to deprecated `OPENAI_BASE_URL` env var but warn user of deprecation when no `openai_base_url` config key is present - update CLI, SDK, and TUI code to prefer the new config path (with a deprecated env-var fallback) and document the SDK behavior change