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/tasks/tasks.service.ts

@@ -3,6 +3,7 @@ import { PrismaService } from '../prisma/prisma.service';
 import { AuditLogService } from '../audit/audit-log.service';
 import { WebhooksService } from '../webhooks/webhooks.service';
 import { TaskTemplatesService } from '../task-templates/task-templates.service';
+import { CalendarSyncService } from '../calendar-sync/calendar-sync.service';
 import { Task, TaskPriority, TaskStatus } from '../../generated/prisma';
 import { CreateTaskDto } from './dto/create-task.dto';
 import { UpdateTaskDto } from './dto/update-task.dto';
@@ -19,6 +20,7 @@ export class TasksService {
     private readonly auditLog: AuditLogService,
     private readonly webhooks: WebhooksService,
     private readonly taskTemplates: TaskTemplatesService,
+    private readonly calendarSync: CalendarSyncService,
   ) {}
 
   async findAll(filter: TaskFilter): Promise<Task[]> {
@@ -53,6 +55,9 @@ export class TasksService {
       afterData: task,
     });
     await this.webhooks.dispatch('task.created', task);
+    if (task.dueDate) {
+      await this.calendarSync.enqueue('TASK', task.id);
+    }
     return task;
   }
 
@@ -77,6 +82,11 @@ export class TasksService {
       beforeData: before,
       afterData: task,
     });
+    if (task.dueDate) {
+      await this.calendarSync.enqueue('TASK', task.id);
+    } else {
+      await this.calendarSync.cancel('TASK', task.id);
+    }
     return task;
   }
 
@@ -95,6 +105,7 @@ export class TasksService {
       afterData: task,
     });
     await this.webhooks.dispatch('task.completed', task);
+    await this.calendarSync.cancel('TASK', task.id);
     return task;
   }
 }