The /model picker emitted a standalone slug=openai row (gated on
OPENAI_API_KEY). Selecting it ran resolve_provider_full("openai"),
which resolved the legacy providers.py alias openai->openrouter BEFORE
checking the user's own providers.openai config — silently switching
users onto OpenRouter (HTTP 401 when they have no OR key).
- model_switch.list_authenticated_providers: skip vendor names that are
aliases to an aggregator (isolates openai->openrouter; copilot/kimi/etc.
are real providers and unaffected). Kills the phantom picker row.
- providers.resolve_provider_full: user-config providers.<name> now wins
over the built-in alias table, so providers.openai (api.openai.com)
beats the alias.
- model_switch PATH A: user-config providers resolve credentials via
their own endpoint instead of the name-based runtime resolver that
doesn't know user-config slugs; plus a fail-loud guard for explicit
unauthed-aggregator hops.
Verified E2E with the reporter's config (no OR key): selecting OpenAI +
gpt-4o-mini now resolves to api.openai.com instead of openrouter.ai.
21f55af769