feat: sync calendar entries to a Microsoft 365 group calendar

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]>

ApiCore-Backend/src/auth/permissions/permission-catalog.ts

@@ -271,7 +271,15 @@ export const PERMISSION_CATALOG = [
     2400,
   ),
   ...group('Audit-Log', 'audit', [['read', 'Ansehen']], 2500),
-  ...group('Kalender', 'calendar', [['read', 'Ansehen']], 2600),
+  ...group(
+    'Kalender',
+    'calendar',
+    [
+      ['read', 'Ansehen'],
+      ['configure', 'M365-Synchronisation konfigurieren'],
+    ],
+    2600,
+  ),
   ...group('Dashboard', 'dashboard', [['read', 'Ansehen']], 2700),
   ...group('Statistik', 'statistics', [['read', 'Ansehen']], 2800),
   ...group('Suche', 'search', [['read', 'Ansehen']], 2900),