feat: T6 wave 5 – readiness checks and report, compliance and medicine UI, label UI

- Readiness: all 18 checks (medicine lots, treatment log gaps, labels,
  harvest withdrawal), medicine subjects masked without
  veterinary-medicines:read, report PDF (counts only), summary cached 60 s,
  409 codes READINESS_*.
- Frontend: /compliance page with acknowledge/revoke, dashboard line and
  nav; veterinary medicine catalogue, lots, movement book with inventory
  and disposal; label designer check panel, print card with gap list and
  proof print, food business master data, product legal name.
- Service worker: cacheability is path-based (the backend sends no-store
  on every answer); compliance, medicine, restriction, notice and label
  check/print paths and restricted document kinds are never cached.
- ARCHITECTURE.md §2, §12.10–12.11, Annahmen 86–90.

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

ApiCore-Frontend/src/lib/label-templates/api.ts

@@ -1,5 +1,4 @@
 import { apiFetch, apiFetchBlob } from "@/lib/auth/api-client";
-import { downloadBlob } from "@/lib/export/api";
 import { CreateLabelTemplateInput, LabelTemplate, UpdateLabelTemplateInput } from "./types";
 
 export function fetchLabelTemplates(): Promise<LabelTemplate[]> {
@@ -27,15 +26,32 @@ export function deactivateLabelTemplate(id: string): Promise<LabelTemplate> {
   return apiFetch<LabelTemplate>(`/label-templates/${encodeURIComponent(id)}`, { method: "DELETE" });
 }
 
+export interface PrintLabelsOptions {
+  /** 1 = top left of the sheet; omitted prints from the start. */
+  startPosition?: number;
+  /** A test print stamped „MUSTER – nicht verkaufsfähig“; always allowed. */
+  proof?: boolean;
+}
+
+/**
+ * The label PDF. A 409 `LABEL_PARTICULARS_MISSING` throws an `ApiError` whose
+ * `body.gaps` lists what is missing (`labelParticularsMissing` reads it).
+ */
 export async function printLabels(
   templateId: string,
   bottlingBatchId: string,
-  startPosition?: number,
-): Promise<void> {
-  const query = startPosition && startPosition > 1 ? `?startPosition=${startPosition}` : "";
-  const { blob, filename } = await apiFetchBlob(
+  options: PrintLabelsOptions = {},
+): Promise<Blob> {
+  const params = new URLSearchParams();
+  if (options.startPosition && options.startPosition > 1) {
+    params.set("startPosition", String(options.startPosition));
+  }
+  if (options.proof) params.set("proof", "true");
+  const query = params.size > 0 ? `?${params.toString()}` : "";
+  const { blob } = await apiFetchBlob(
     `/label-templates/${encodeURIComponent(templateId)}/print/${encodeURIComponent(bottlingBatchId)}${query}`,
     "etiketten.pdf",
+    { cache: "no-store" },
   );
-  downloadBlob(blob, filename);
+  return blob;
 }