Provider auth failures were logged with the provider's opaque message only
(e.g. OpenRouter returns "401: User not found." for a bad/missing API key),
which reads like a missing wiki user rather than a credentials problem.
describeProviderError now prepends a clear, human-readable English label for
a small set of well-known HTTP statuses while keeping the original detail
(status + provider message + truncated response-body snippet):
- 401/403 -> authentication failed (invalid or missing API key)
- 402 -> insufficient credits or quota
- 429 -> rate limit exceeded
Other statuses and status-less errors are formatted exactly as before. The
label is a static string and never contains the API key. Benefits every
caller (embedding processor, indexer, AI "Test endpoint" UI) at once.
Tests: switch the plain status+message case to a non-classified status (500);
add 401/403/402/429 cases; keep 502/503 as regression guards for the
unchanged path.
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