* feat(cli): keep the ChatGPT login with lite codex --subscription
`lite codex --subscription` points Codex at a `litellm_subscription` provider with requires_openai_auth on and no env_key, so Codex keeps its own ChatGPT login and the LiteLLM key is sent only in the x-litellm-api-key header from LITELLM_PROXY_API_KEY. OPENAI_API_KEY is left exactly as the user had it, and the pre-launch key check sends the key the same way
`codex_subscription` is a new `lite config` key that turns the flag on by default, like `claude_subscription` does for `lite claude`. The Claude `--settings` overlay now applies to Claude Code only
* fix(cli): leave the Codex Stop hook out of subscription launches and load tomli on Python 3.10
* fix(cli): leave OPENAI_BASE_URL as the user had it with lite codex --subscription
* fix(cli): give lite codex --subscription its own Codex provider id
* test(cli): type the Codex config override helpers
* fix(cli): leave the Codex model list to Codex in subscription mode
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Co-authored-by: mateo-berri <277851410+mateo-berri@users.noreply.github.com>