feat: platform backbone and field capture complete (checkpoint)

Platform backbone (plan 2026-10-13-plattform-rueckgrat), all tasks reviewed:
- webhooks with delivery table, retries and stable delivery id
- calendar handlers; a finished task removes its Outlook event
- tasks, automations, inspections, varroa, treatments, feedings,
  harvests, colonies, wintering, stock and bottling record domain events
  in the same transaction; legacy post-commit calls removed
- row locks through one helper (lockRowForUpdate, lockRowsForShare,
  lockRowsForUpdate)
- job framework with JobRun, cli exit codes, cleanup, task templates,
  daily evaluation, hourly app-backup and the rekey job
- system API and page "Verwaltung > System" with retry
- @nestjs/schedule removed, guard tests against in-process schedulers

Field capture T3 (plan 2026-10-13-t3-erfassung-am-stand), all tasks reviewed:
- inspection photo offline without metadata
- bulk capture for treatments, feedings and varroa (backend + frontend)
- offline stand mode with service worker, offline pages and packs
- offline session, cold start and logout on shared devices

Docs: ARCHITECTURE.md assumptions and sections updated, TASKS.md.
Gates: backend lint, typecheck, 1770 unit, 420 e2e, build, no schema
drift; frontend lint, typecheck, 913 tests, build. Not rolled out.

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

ApiCore-Frontend/src/lib/bulk/api.ts

@@ -0,0 +1,102 @@
+import { ApiError, apiFetch } from "@/lib/auth/api-client";
+import { CreateOptions, idempotencyHeaders } from "@/lib/offline/idempotency";
+import { invalidColonyIdsOfBody } from "./bulk-input";
+import type { CreateTreatmentInput, Treatment } from "@/lib/treatments/types";
+import type { CreateFeedingInput, Feeding } from "@/lib/feedings/types";
+import type { CreateVarroaMeasurementInput, VarroaMeasurement } from "@/lib/varroa/types";
+
+/** Mirrors ApiCore-Backend/src/common/bulk/bulk-limits.ts - keep both in step. */
+export const BULK_MAX_COLONIES = 100;
+
+export interface BulkCreateResult<T> {
+  bulkId: string;
+  records: T[];
+}
+
+export interface BulkCreateTreatmentInput extends Omit<CreateTreatmentInput, "colonyId"> {
+  colonyIds: string[];
+}
+
+export interface BulkCreateFeedingInput extends Omit<CreateFeedingInput, "colonyId"> {
+  colonyIds: string[];
+}
+
+/** What each colony has of its own in a bulk count. */
+export interface BulkVarroaEntry {
+  colonyId: string;
+  miteCount?: number | null;
+  calculatedValue?: number | null;
+  assessment?: string | null;
+}
+
+export interface BulkCreateVarroaInput
+  extends Omit<
+    CreateVarroaMeasurementInput,
+    "colonyId" | "miteCount" | "calculatedValue" | "assessment"
+  > {
+  entries: BulkVarroaEntry[];
+}
+
+function postBulk<Record>(
+  path: string,
+  input: unknown,
+  options: CreateOptions,
+): Promise<BulkCreateResult<Record>> {
+  return apiFetch<BulkCreateResult<Record>>(path, {
+    method: "POST",
+    headers: idempotencyHeaders(options),
+    body: JSON.stringify(input),
+  });
+}
+
+export function createTreatmentsBulk(
+  input: BulkCreateTreatmentInput,
+  options: CreateOptions = {},
+): Promise<BulkCreateResult<Treatment>> {
+  return postBulk("/treatments/bulk", input, options);
+}
+
+export function createFeedingsBulk(
+  input: BulkCreateFeedingInput,
+  options: CreateOptions = {},
+): Promise<BulkCreateResult<Feeding>> {
+  return postBulk("/feedings/bulk", input, options);
+}
+
+export function createVarroaBulk(
+  input: BulkCreateVarroaInput,
+  options: CreateOptions = {},
+): Promise<BulkCreateResult<VarroaMeasurement>> {
+  return postBulk("/varroa-measurements/bulk", input, options);
+}
+
+/**
+ * The colonies a refused bulk entry could not be recorded for (400
+ * `invalidColonyIds`: unknown or ended since the pack was loaded). Empty for
+ * every other error.
+ */
+export function invalidColonyIdsOf(error: unknown): string[] {
+  return error instanceof ApiError ? invalidColonyIdsOfBody(error.body) : [];
+}
+
+/**
+ * The two 409 texts of the idempotency interceptor that mean „later“. The
+ * server sends no error code for them; api.spec.ts pins both to its source.
+ */
+export const RETRY_LATER_MESSAGES = [
+  "Diese Anfrage wird bereits verarbeitet - bitte kurz warten",
+  "Diese Anfrage wurde gerade abgebrochen - bitte erneut senden",
+] as const;
+
+/**
+ * 409 „wird bereits verarbeitet“ (the same key is still running) and „gerade
+ * abgebrochen“ (it was just released): nothing is wrong with the entry, the
+ * answer is „später erneut“. Other 409s (key used for another action) are real.
+ */
+export function isRetryLaterError(error: unknown): boolean {
+  return (
+    error instanceof ApiError &&
+    error.status === 409 &&
+    RETRY_LATER_MESSAGES.some((message) => error.message === message)
+  );
+}