For example, I have github Copilot account on pi backend, ollama but not 24/7 available, openrouter, codex (big) with $200 subscription, and codex (small) with $20 subscription.
For the codex I want to use the codex backend not pi.
So my preferred fallbackorder is:
codex small (codex backend)
codex big (codex backend)
GitHub Copilot
ollama
openrouter
how to achieve this it needs to handle different account + same provider scenario, and backend switching. is this supported or not? give me a concrete example of openclaw.json and auth profiles, as well as any CLI I need to set it up