The desktop "Local / custom endpoint" onboarding never collected an API
key and /api/model/set silently dropped one, so an auth-gated endpoint
(e.g. a hosted vLLM behind a key) could never enumerate models — and
Settings' "Set up custom endpoint" routed `custom` into a non-existent
OAuth flow, booting the user back to the first screen (the reported loop).
Backend (web_server.py):
- /api/providers/validate accepts an optional api_key and sends it as a
Bearer header when probing a custom endpoint's /v1/models.
- /api/model/set accepts api_key, persists it to model.api_key (same
switch/preserve lifecycle as base_url), and registers a named
custom_providers entry via _save_custom_provider — matching the
`hermes model` CLI flow so the endpoint shows up as a ready picker row.
Desktop:
- ApiKeyForm shows an optional API key field for the local/custom option;
the key is threaded through saveOnboardingLocalEndpoint → validate +
setModelAssignment.
- New onboarding `localEndpoint` intent + startManualLocalEndpoint(); the
Settings "Set up custom endpoint" button now opens the local-endpoint
form (URL + key) instead of the OAuth dead-end.
- Added localApiKeyPlaceholder i18n key (en + types + zh).
Tests: api_key lifecycle on _apply_main_model_assignment, key persistence
+ custom_providers registration on /api/model/set, Bearer-header probe;
onboarding store forwards + persists the key.
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