feat: platform backbone and field capture, first part (checkpoint)

Platform backbone (plan 2026-10-13-plattform-rueckgrat), reviewed tasks:
- run roles api/worker/job/all with shared startup checks (Task 1)
- schema and migration for DomainEvent, deliveries, JobRun, ThrottlerHit (Task 2)
- audit, notifications and domain events written in the same transaction (Task 3)
- dispatcher with SKIP LOCKED claims, retries and stale release (Task 4)
- worker building blocks: tick, LISTEN/NOTIFY wake-up, health (Task 5)
- worker process and entry points (Task 6)
- throttler counters in Postgres (Task 19)
- separate keys per purpose with key ring (Task 20)
- public origin page without exact location (Task 22)
- shop keys split into read and write (Task 23)
- Kustomize base, components, overlay encry, CI validation (Task 26)

Field capture T3 (plan 2026-10-13-t3-erfassung-am-stand), reviewed tasks:
- brood frames, read endpoints, apiary overview and offline pack
- network basics, offline queue v3, navigation sheets, form building blocks
- new inspection with last-time hints and weather, varroa per day,
  treatment prefill, apiary page with round
- inspection photo (Task 10) is implemented, review pending

Not rolled out. Remaining tasks follow in later commits.

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

ApiCore-Frontend/src/components/varroa/varroa-rate-light.tsx

@@ -0,0 +1,55 @@
+import { AlertTriangle, CheckCircle2, OctagonAlert } from "lucide-react";
+import { RATING_TONE_CLASS } from "@/lib/forms/rating";
+import { formatMitesPerDay, formatThreshold } from "@/lib/varroa/format";
+import { VarroaLight, varroaLight } from "@/lib/varroa/rate";
+import { cn } from "@/lib/utils";
+
+const LIGHTS: Record<VarroaLight, { Icon: typeof CheckCircle2; tone: string }> = {
+  green: { Icon: CheckCircle2, tone: RATING_TONE_CLASS[4] },
+  yellow: { Icon: AlertTriangle, tone: RATING_TONE_CLASS[3] },
+  red: { Icon: OctagonAlert, tone: RATING_TONE_CLASS[1] },
+};
+
+function lightText(light: VarroaLight, threshold: number): string {
+  if (light === "red") return "über der Schwelle, Behandlung prüfen";
+  if (light === "yellow") return "nahe an der Schwelle";
+  return `unter der Schwelle (${formatThreshold(threshold)}/Tag)`;
+}
+
+/**
+ * The live result of the count. The state is always spelled out and has an
+ * icon, so it never depends on the colour alone.
+ */
+export function VarroaRateLight({
+  rate,
+  threshold,
+}: {
+  rate: number | null;
+  threshold: number | null;
+}) {
+  const light = varroaLight(rate, threshold);
+  if (rate === null) {
+    return <div role="status" aria-live="polite" />;
+  }
+  const base = `${formatMitesPerDay(rate)} Milben/Tag`;
+  if (light === null || threshold === null) {
+    return (
+      <p role="status" aria-live="polite" className="text-sm font-medium">
+        {base}
+      </p>
+    );
+  }
+  const { Icon, tone } = LIGHTS[light];
+  return (
+    <p
+      role="status"
+      aria-live="polite"
+      className={cn("flex min-h-11 items-center gap-2 rounded-lg border px-3 text-sm font-medium", tone)}
+    >
+      <Icon aria-hidden className="size-5 shrink-0" />
+      <span>
+        {base} – {lightText(light, threshold)}
+      </span>
+    </p>
+  );
+}