feat: T6 wave 3 – treatment books from lot, label print lock, restricted zone, authority notices

- Treatments book their dose from a medicine lot (delta booking on edit,
  bulk all-or-nothing, idempotent); Bestandsbuch columns from the lot,
  FEHLT exactly where treatmentLogGaps reports a gap; Bestandsbuch export
  needs veterinary-medicines:read.
- Label printing: 409 LABEL_PARTICULARS_MISSING on gaps, proof print with
  watermark, PRINT audit before the PDF, check endpoints; digit rules only
  from the seeded ComplianceSettings row (fail closed).
- Restricted zone (Berlin day): create, update, move, merge and CSV import
  blocked inside an active restriction; override with reason and
  compliance:manage, audited, never stored on the colony; split, harvest
  and dissolve stay free; restriction details only with compliance:read.
- Authority notices: settings, herd snapshot, registration/herd change/TSK
  notices with one open draft per kind under the settings lock.
- Label check refinements (geometric reading order, number|unit pairs).
- ARCHITECTURE.md §12.6–12.8, Annahmen 71–77; spec §5.6 Berlin day.

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

ApiCore-Backend/src/compliance/tsk-day.spec.ts

@@ -0,0 +1,25 @@
+import { isValidMonthDay, tskReferenceDayOf } from './tsk-day';
+
+describe('isValidMonthDay', () => {
+  it.each(['02-30', '02-29', '1-1', '13-01', '00-10', 'ab-cd', '01-32', ''])(
+    'rejects %s',
+    (value) => {
+      expect(isValidMonthDay(value)).toBe(false);
+    },
+  );
+
+  it.each(['01-01', '12-31', '02-28', '04-30'])('accepts %s', (value) => {
+    expect(isValidMonthDay(value)).toBe(true);
+  });
+});
+
+describe('tskReferenceDayOf', () => {
+  it('joins year and month-day into a day', () => {
+    expect(tskReferenceDayOf(2027, '01-01')).toBe('2027-01-01');
+    expect(tskReferenceDayOf(2028, '12-31')).toBe('2028-12-31');
+  });
+
+  it('rejects an invalid month-day', () => {
+    expect(() => tskReferenceDayOf(2027, '02-29')).toThrow();
+  });
+});