feat: T6 wave 2 – medicine book, document rights, label particulars, herd events

- Veterinary medicine catalogue, lots and append-only movement ledger
  (rest always computed; corrections as counter-bookings; inactive
  medicines take no new stock; unit must match on lot moves).
- Documents of medicine lots, authority notices and restrictions need the
  domain right on top of documents:* (403 before any lookup).
- Label particulars: pure checkLabel with six mandatory gaps and four
  warnings, AFM font metrics, Berlin-day dates, geometric reading order
  for split addresses, new master-data fields with row-locked updates.
- Herd events ColonyCreated, ColonyMoved, ApiaryChanged and
  TskReferenceDayReached (ids only, never forwarded to webhooks); CSV
  import emits ColonyCreated with audit.
- ARCHITECTURE.md §12 Compliance (T6), Annahmen 59–70.

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

ApiCore-Backend/src/label-templates/label-compliance-null-contract.spec.ts

@@ -0,0 +1,29 @@
+import { UpdateLabelTemplateDto } from './dto/update-label-template.dto';
+import { UpdateProductDto } from '../products/dto/update-product.dto';
+import { UpdateSiteSettingsDto } from '../site-settings/dto/update-site-settings.dto';
+import { describeNullContracts } from '../common/validation/null-contract.spec-helper';
+
+// Only the fields T6 Task 5 adds; the older fields stay in
+// update-dto-null-handling.spec.ts.
+describeNullContracts('Label particulars null contracts', {
+  UpdateSiteSettingsDto: {
+    dto: UpdateSiteSettingsDto,
+    notNull: [],
+    clearable: [
+      'foodBusinessName',
+      'foodBusinessAddress',
+      'holderName',
+      'holderAddress',
+    ],
+  },
+  UpdateProductDto: {
+    dto: UpdateProductDto,
+    notNull: [],
+    clearable: ['legalName'],
+  },
+  UpdateLabelTemplateDto: {
+    dto: UpdateLabelTemplateDto,
+    notNull: ['minXHeightMm'],
+    clearable: [],
+  },
+});