Adds a one-way push (ApiCore -> M365) of Aufgaben/Durchsichten/ Behandlungen/Fütterungen/Ernten/Königinnen-Zuordnungen into the calendar of a Microsoft 365 group, via the Graph API. - CalendarSyncModule (app-only client-credentials Graph auth, separate from the interactive SSO app registration; new env vars M365_CALENDAR_TENANT_ID/_CLIENT_ID/_CLIENT_SECRET). - Outbox + minute-interval cron worker (CalendarSyncOutboxEntry) instead of a synchronous push, since Graph calls are too slow/flaky to block a domain create request on; failed syncs retry up to 5 times. - Per-source-type toggle plus a group-ID field, configurable in Verwaltung > Automatisierung > Kalender-Sync (Verwaltung > Backup, an env var still wins on those fields where one applies to related config). - Hooked into Tasks/Inspections/Treatments/Feedings/Harvests/Queens at their existing create (and Task update/complete) points; entries render as all-day Graph events to avoid timezone ambiguity. - Documents the design decision in ARCHITECTURE.md (Annahme 9), since this is a net-new capability the lastenheft doesn't scope. Co-Authored-By: Claude Sonnet 5 <[email protected]>