Custom/aliased providers with keys in the credential pool (added via
hermes auth add) were reported unconfigured in the WebUI because provider
detection only checked env vars. Add _has_explicit_pool_credentials() that
checks the pool while filtering the ambient gh_cli entry (so Copilot doesn't
falsely show configured on any machine with gh installed), cache-routed to
avoid the cold per-provider load_pool latency, and resolve provider aliases
before load_pool() at every retrieval site so detection and retrieval read
the same pool (glm->zai, github->copilot, etc.). /api/models/live wrapped in
profile scope; getattr-safe runtime_api_key for OAuth-only entries.
Co-authored-by: akrhin <akrhin@users.noreply.github.com>
