feat(backend): Webhooks mit HMAC-signierter Auslieferung (Modul 28)

WebhooksModule (WebhookSubscription: URL, Events, Secret, aktiv) mit
Event-Dispatcher, angehaengt an 10 Ereignisse in 8 bestehenden Services
(colony.created, inspection.created, queen.created, queen.replaced,
harvest.created, batch.created, batch.updated, product.stock_changed,
task.created, task.completed). Auslieferung ist best-effort und blockiert
die ausloesende Anfrage nicht bei Fehlern.

ApiCore-Backend/src/colonies/colonies.service.ts

@@ -5,6 +5,7 @@ import {
 } from '@nestjs/common';
 import { PrismaService } from '../prisma/prisma.service';
 import { AuditLogService } from '../audit/audit-log.service';
+import { WebhooksService } from '../webhooks/webhooks.service';
 import { Colony, ColonyStatus } from '../../generated/prisma';
 import { CreateColonyDto } from './dto/create-colony.dto';
 import { UpdateColonyDto } from './dto/update-colony.dto';
@@ -22,6 +23,7 @@ export class ColoniesService {
   constructor(
     private readonly prisma: PrismaService,
     private readonly auditLog: AuditLogService,
+    private readonly webhooks: WebhooksService,
   ) {}
 
   async findAll(filter: ColonyFilter = {}): Promise<Colony[]> {
@@ -56,6 +58,7 @@ export class ColoniesService {
       userId: actingUserId,
       afterData: colony,
     });
+    await this.webhooks.dispatch('colony.created', colony);
     return colony;
   }