feat(backend): Abfuellungen und Produkte (Modul 23)

ProductsModule (GET/POST /products, GET/PATCH /products/:id) und
BottlingModule (GET/POST /bottling-batches) mit transaktionaler
Reduzierung der HoneyBatch-Restmenge beim Abfuellen; Ablehnung bei
Abfuellmenge > verfuegbarer Menge. Neue Prisma-Modelle Product und
BottlingBatch (Migration bottling_products).

ApiCore-Backend/src/app.module.ts

@@ -22,6 +22,8 @@ import { DashboardModule } from './dashboard/dashboard.module';
 import { SearchModule } from './search/search.module';
 import { ExportModule } from './export/export.module';
 import { QrModule } from './qr/qr.module';
+import { ProductsModule } from './products/products.module';
+import { BottlingModule } from './bottling/bottling.module';
 import { JwtAuthGuard } from './auth/guards/jwt-auth.guard';
 import { RolesGuard } from './auth/guards/roles.guard';
 
@@ -49,6 +51,8 @@ import { RolesGuard } from './auth/guards/roles.guard';
     SearchModule,
     ExportModule,
     QrModule,
+    ProductsModule,
+    BottlingModule,
   ],
   controllers: [],
   providers: [