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/queens/queens.service.ts

@@ -1,6 +1,7 @@
 import { Injectable, NotFoundException } from '@nestjs/common';
 import { PrismaService } from '../prisma/prisma.service';
 import { AuditLogService } from '../audit/audit-log.service';
+import { WebhooksService } from '../webhooks/webhooks.service';
 import { Queen, QueenStatus } from '../../generated/prisma';
 import { CreateQueenDto } from './dto/create-queen.dto';
 import { UpdateQueenDto } from './dto/update-queen.dto';
@@ -16,6 +17,7 @@ export class QueensService {
   constructor(
     private readonly prisma: PrismaService,
     private readonly auditLog: AuditLogService,
+    private readonly webhooks: WebhooksService,
   ) {}
 
   async findAll(filter: QueenFilter = {}): Promise<Queen[]> {
@@ -42,6 +44,7 @@ export class QueensService {
       userId: actingUserId,
       afterData: queen,
     });
+    await this.webhooks.dispatch('queen.created', queen);
     return queen;
   }
 
@@ -117,7 +120,9 @@ export class QueensService {
       afterData: { ...queen, assignedColonyId: colony.id },
     });
 
-    return this.findById(id);
+    const updated = await this.findById(id);
+    await this.webhooks.dispatch('queen.replaced', updated);
+    return updated;
   }
 
   async getHistory(id: string) {