App settings
Fill these in and Save — no files to edit. Works while you run the app locally. After saving, redeploy and everyone gets it automatically. (Adding a brand-new provider also needs a small code change to the proxy — that one's a developer task.)
Basics
Providers
Edit how each provider appears and where people get a free key. (The key formats and the proxy URLs are fixed in code.)
Routing (which models, in order)
One per line: providerId modelName. The app tries them top to bottom and skips any it can't reach. Fix a drifted model name here.