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60c7675f18
API-key providers with anonymousFallback: true (opencode-go, opencode-zen, pollinations, kilocode) receive a synthetic "noauth" connection whenever all real connections are terminal (credits_exhausted/banned/expired) or unavailable. The opencode upstream now rejects anonymous requests with 401 Missing API key, so the fallback adds a guaranteed-failing round trip and health/reconnect noise before the combo moves on. Add a noAuthFallbackDisabledProviders settings array (zod-validated, persisted via /api/settings, following the blockedProviders pattern). When a provider is listed, maybeSyntheticNoAuthFallback returns null for anonymousFallback-only providers, so exhausted providers are skipped immediately as allExpired/allRateLimited while real keyed connections keep working and recover automatically once quota state clears. True no-auth providers are unaffected; blockedProviders remains their disable mechanism. Default (absent/empty list) preserves current behavior. Provider detail pages for anonymousFallback providers gain an "Anonymous fallback" toggle (default ON) backed by the new setting. Refs #9674