fix: Paket 0 – data integrity, security hardening and field usability

Backend
- Backup covers every Prisma model (bundle v3); a guard test fails for any
  new model that is neither backed up nor explicitly excluded. Unsealed
  bundles may only add rows to 27 legacy master/field tables and never
  overwrite; counters, ledgers, settings, roles etc. need a sealed file.
  Shared import limit BACKUP_MAX_IMPORT_BYTES (default 50 MB, max 256 MB)
  with warnings in log and UI; replaced document files are removed after
  commit.
- Post-commit side effects (automation, calendar sync, webhooks) run via
  runAfterCommit and never turn a committed write into a 500, so retries
  with the same Idempotency-Key no longer create duplicates.
- Calendar outbox is multi-replica safe: per-entry claims with stale
  takeover, revision-based settle, new Graph event only on 404/410,
  transactionId on create, 30 s Graph timeout, URL-encoded ids, GUID
  validation for groupId, "run now" in background and resets FAILED.
- Automation tasks are deduplicated under a row lock on the rule.
- Update DTOs follow one null rule: omitted = unchanged, null clears a
  nullable field, null on a required field is a 400.
- Varroa mites/day is recomputed on correction; withdrawal status is
  checked against the harvest date (?at=), bounded colonyIds; inspection
  create is audited; updates re-enqueue calendar entries.
- Dashboard, statistics and apiary/colony guards treat WEAK, CONSPICUOUS
  and QUEENLESS colonies as living.
- Prisma errors and body-parser errors are logged without query values or
  request bodies.
- Migration 20261012100000_calendar_sync_claims; schema index name aligned
  with the existing database object.

Frontend
- Sticky save bar sticks again (no scroll container ancestors, card uses
  overflow-clip), safe-area insets, scroll-padding, FAB hidden on forms,
  sticky desktop sidebar.
- Inspections record yes / no / not checked instead of silent defaults.
- All living colonies are selectable; shared RecordSelect, EnumSelect,
  ChoiceGroup and TriStateField replace per-page copies; selects show
  names instead of ids; labels point at real controls.
- Emptied optional fields are sent as null (emptyToNull) so every field
  can be cleared; dates default to the local day and are sent via
  toApiDate.
- Harvest withdrawal warning uses the harvest date; backup page warns when
  a backup outgrows the import limit and lists skipped tables.

Build and docs
- Docker builds fail unless lint, typecheck and unit tests pass.
- ARCHITECTURE.md updated (assumptions 9-12, 19-21, section 8) and spec
  docs/superpowers/specs/2026-10-12-plattform-rueckgrat-und-fahrplan-design.md
  for the backbone (api/worker/job roles, domain event outbox) and the
  feature roadmap T3-T7.

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

ApiCore-Backend/test/task-templates.e2e-spec.ts

@@ -10,6 +10,9 @@ interface TaskTemplateBody {
   id: string;
   nextDueDate: string;
   active: boolean;
+  recurrenceType: string;
+  recurrenceDayOfMonth: number | null;
+  intervalDays: number | null;
 }
 
 describe('TaskTemplates (e2e)', () => {
@@ -96,6 +99,42 @@ describe('TaskTemplates (e2e)', () => {
     expect(template.nextDueDate.getTime()).toBeGreaterThan(yesterday.getTime());
   });
 
+  it('rejects a recurrence emptied of a field it needs', () => {
+    return request(app.getHttpServer())
+      .patch(`/api/v1/task-templates/${templateId}`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({ recurrenceType: 'MONTHLY', recurrenceDayOfMonth: null })
+      .expect(400);
+  });
+
+  it('clears the interval when switching to a monthly recurrence', async () => {
+    const response = await request(app.getHttpServer())
+      .patch(`/api/v1/task-templates/${templateId}`)
+      .set('Authorization', `Bearer ${beekeeperToken}`)
+      .send({
+        recurrenceType: 'MONTHLY',
+        recurrenceDayOfMonth: 5,
+        intervalDays: null,
+      })
+      .expect(200);
+    const body = response.body as TaskTemplateBody;
+    expect(body.recurrenceType).toBe('MONTHLY');
+    expect(body.recurrenceDayOfMonth).toBe(5);
+    expect(body.intervalDays).toBeNull();
+    const auditEntry = await prisma.auditLog.findFirst({
+      where: {
+        entityType: 'TaskTemplate',
+        entityId: templateId,
+        action: 'UPDATE',
+        userId: beekeeperId,
+      },
+      orderBy: { timestamp: 'desc' },
+    });
+    expect(auditEntry?.afterData).toEqual(
+      expect.objectContaining({ intervalDays: null }),
+    );
+  });
+
   it('deactivates a template', async () => {
     const response = await request(app.getHttpServer())
       .post(`/api/v1/task-templates/${templateId}/deactivate`)