feat: add website social link, fix herkunft origin display, GUI backup schedule, and format-based batch numbering

- SiteSettings gains websiteUrl (e.g. online shop link) alongside the
  existing social links, editable in Verwaltung > Automatisierung.
- /herkunft/[lot] now shows the apiary's Standort instead of its internal
  Name (so multiple apiaries at one location read as one origin), adds
  small icons per social link, and surfaces previously-fetched-but-unused
  data (Honigsorte, Abfülldatum, stat cards) to make the page a richer
  customer-facing info page.
- Backup schedule (path/cron/retention) is now also configurable via the
  GUI (Verwaltung > Backup), stored in a new BackupSettings singleton;
  an env var always wins over the GUI value per field, and the scheduler
  reloads its cron job live when GUI settings change.
- New Automatisierung rules let an admin define a format (e.g.
  "WH-{YYYY}-{SEQ:4}") that auto-generates HoneyBatch.batchNumber and
  BottlingBatch.lotNumber on creation, with an atomic per-rule sequence
  counter and a manual reset. Manual entry still works when the rule is
  inactive.

ApiCore-Backend/src/automation/number-format.spec.ts

@@ -0,0 +1,31 @@
+import { formatGeneratedNumber } from './number-format';
+
+describe('formatGeneratedNumber', () => {
+  // Constructed via local-time components (not an ISO string) so the test
+  // is deterministic regardless of the machine's timezone.
+  const date = new Date(2026, 2, 7);
+
+  it('substitutes year, month, day and a zero-padded sequence', () => {
+    const result = formatGeneratedNumber('WH-{YYYY}-{SEQ:4}', 7, date);
+
+    expect(result).toBe('WH-2026-0007');
+  });
+
+  it('supports {YY}, {MM}, {DD} and an unpadded {SEQ}', () => {
+    const result = formatGeneratedNumber('{YY}{MM}{DD}-{SEQ}', 3, date);
+
+    expect(result).toBe('260307-3');
+  });
+
+  it('does not truncate a sequence wider than the requested padding', () => {
+    const result = formatGeneratedNumber('L-{SEQ:2}', 12345, date);
+
+    expect(result).toBe('L-12345');
+  });
+
+  it('leaves a format with no placeholders unchanged', () => {
+    const result = formatGeneratedNumber('FIXED-NUMBER', 1, date);
+
+    expect(result).toBe('FIXED-NUMBER');
+  });
+});