Cronjobs and Telegram bots threw a hard error when an agent had no
assigned user API key, even for providers (nvidia/gemini/minimax/
pollinations) whose server-side key ChatEndpoint resolves automatically
via ResolveProviderConfig. The guard blocked every non-empty provider
instead of only "openai", so e.g. the nvidia agent failed on "Jetzt
ausführen" although the normal chat worked.
Mirror ChatEndpoint's three-way handling at all three sites
(ExecuteCronjob, SendCronjobNotification, TelegramService.HandleMessage):
- Anthropic (empty provider): Claude CLI fallback when permitted/available
- "openai": hard error (no server key, no CLI equivalent)
- other providers: pass through with empty token; server key resolved later
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
