feat(ui): raw material lots and production inputs

- Pages for raw material lots (beeswax, propolis): list, create in grams
  with optional apiary, detail with stock card (harvested / used in
  production / withdrawn / remaining) and "used in" batches.
- Production batch form takes the raw material used (lot + grams) and the
  batch page shows what it was made from - traceability both ways.
- Sidebar entry "Rohstoffe".
- Removes backend files that were committed into ApiCore-Frontend/src by
  mistake in e52a605 (copies of ApiCore-Backend/src/raw-materials).

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

ApiCore-Frontend/src/lib/raw-materials/api.ts

@@ -0,0 +1,33 @@
+import { apiFetch } from "@/lib/auth/api-client";
+import {
+  CreateRawMaterialLotInput,
+  RawMaterialKind,
+  RawMaterialLot,
+} from "./types";
+
+export function fetchRawMaterialLots(
+  kind?: RawMaterialKind,
+): Promise<RawMaterialLot[]> {
+  return apiFetch<RawMaterialLot[]>(
+    `/raw-material-lots${kind ? `?kind=${kind}` : ""}`,
+  );
+}
+
+export function fetchRawMaterialLot(id: string): Promise<RawMaterialLot> {
+  return apiFetch<RawMaterialLot>(`/raw-material-lots/${id}`);
+}
+
+export function createRawMaterialLot(
+  input: CreateRawMaterialLotInput,
+): Promise<RawMaterialLot> {
+  return apiFetch<RawMaterialLot>("/raw-material-lots", {
+    method: "POST",
+    body: JSON.stringify(input),
+  });
+}
+
+export function deleteRawMaterialLot(id: string): Promise<{ id: string }> {
+  return apiFetch<{ id: string }>(`/raw-material-lots/${id}`, {
+    method: "DELETE",
+  });
+}

ApiCore-Frontend/src/lib/raw-materials/labels.spec.ts

@@ -0,0 +1,13 @@
+import { describe, expect, it } from "vitest";
+import { formatGrams } from "./labels";
+
+describe("formatGrams", () => {
+  it("shows kilograms from 1000 g on", () => {
+    expect(formatGrams(4200)).toBe("4,2 kg");
+    expect(formatGrams(1000)).toBe("1 kg");
+  });
+
+  it("keeps grams below a kilogram", () => {
+    expect(formatGrams(180)).toBe("180 g");
+  });
+});

ApiCore-Frontend/src/lib/raw-materials/labels.ts

@@ -0,0 +1,14 @@
+import { RawMaterialKind } from "./types";
+
+export const RAW_MATERIAL_KIND_LABELS: Record<RawMaterialKind, string> = {
+  BEESWAX: "Bienenwachs",
+  PROPOLIS: "Propolis",
+};
+
+/** 4200 -> "4,2 kg", 180 -> "180 g". */
+export function formatGrams(grams: number): string {
+  if (Math.abs(grams) >= 1000) {
+    return `${(grams / 1000).toLocaleString("de-DE", { maximumFractionDigits: 2 })} kg`;
+  }
+  return `${grams.toLocaleString("de-DE")} g`;
+}

ApiCore-Frontend/src/lib/raw-materials/types.ts

@@ -0,0 +1,36 @@
+export type RawMaterialKind = "BEESWAX" | "PROPOLIS";
+
+export interface RawMaterialLot {
+  id: string;
+  kind: RawMaterialKind;
+  lotNumber: string;
+  date: string;
+  /** Gewonnene Menge in Gramm. */
+  quantity: number;
+  apiaryId: string | null;
+  harvestId: string | null;
+  notes: string | null;
+  createdAt: string;
+  /** Rest in Gramm (Ausgangsmenge plus alle Bewegungen). */
+  remainingCount: number;
+  apiary: { id: string; name: string } | null;
+  harvest: { id: string; date: string } | null;
+  usedIn: {
+    id: string;
+    quantity: number;
+    productionBatch: {
+      id: string;
+      lotNumber: string;
+      product: { id: string; name: string };
+    };
+  }[];
+}
+
+export interface CreateRawMaterialLotInput {
+  kind: RawMaterialKind;
+  lotNumber: string;
+  date: string;
+  quantity: number;
+  apiaryId?: string;
+  notes?: string;
+}