feat(frontend): Lagerverwaltung-Ansicht (Modul 12)

/storage mit Lagerbehälter- und Lagerartikelverwaltung inkl.
Bestandsbewegungen (Zugang/Abgang/Umlagerung/Korrektur).

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

@@ -0,0 +1,42 @@
+import { apiFetch } from "@/lib/auth/api-client";
+import {
+  CreateStockItemInput,
+  CreateStockMovementInput,
+  CreateStorageContainerInput,
+  StockItem,
+  StorageContainer,
+} from "./types";
+
+export function fetchStorageContainers(): Promise<StorageContainer[]> {
+  return apiFetch<StorageContainer[]>("/storage-containers");
+}
+
+export function createStorageContainer(
+  input: CreateStorageContainerInput,
+): Promise<StorageContainer> {
+  return apiFetch<StorageContainer>("/storage-containers", {
+    method: "POST",
+    body: JSON.stringify(input),
+  });
+}
+
+export function fetchStockItems(): Promise<StockItem[]> {
+  return apiFetch<StockItem[]>("/stock-items");
+}
+
+export function createStockItem(input: CreateStockItemInput): Promise<StockItem> {
+  return apiFetch<StockItem>("/stock-items", {
+    method: "POST",
+    body: JSON.stringify(input),
+  });
+}
+
+export function addStockMovement(
+  id: string,
+  input: CreateStockMovementInput,
+): Promise<StockItem> {
+  return apiFetch<StockItem>(`/stock-items/${id}/movements`, {
+    method: "POST",
+    body: JSON.stringify(input),
+  });
+}

ApiCore-Frontend/src/lib/storage/types.ts

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+export type StockCategory = "HONEY" | "CONSUMABLE" | "EQUIPMENT_MATERIAL";
+export type StockMovementType = "IN" | "OUT" | "TRANSFER" | "ADJUSTMENT";
+export type StorageContainerStatus = "EMPTY" | "FILLED" | "CLEANING" | "OUT_OF_SERVICE";
+
+export interface StorageContainer {
+  id: string;
+  code: string;
+  containerType: string | null;
+  capacity: number | null;
+  currentAmount: number | null;
+  location: string | null;
+  status: StorageContainerStatus;
+}
+
+export interface StockMovement {
+  id: string;
+  stockItemId: string;
+  type: StockMovementType;
+  quantity: number;
+  date: string;
+  relatedType: string | null;
+  relatedId: string | null;
+  notes: string | null;
+}
+
+export interface StockItem {
+  id: string;
+  name: string;
+  category: StockCategory;
+  unit: string;
+  quantity: number;
+  minThreshold: number | null;
+  notes: string | null;
+  movements?: StockMovement[];
+}
+
+export interface CreateStorageContainerInput {
+  code: string;
+  containerType?: string;
+  capacity?: number;
+  location?: string;
+}
+
+export interface CreateStockItemInput {
+  name: string;
+  category: StockCategory;
+  unit: string;
+  quantity?: number;
+  minThreshold?: number;
+  notes?: string;
+}
+
+export interface CreateStockMovementInput {
+  type: StockMovementType;
+  quantity: number;
+  notes?: string;
+}