feat(frontend): Inventar (Modul 24)

/equipment, /equipment/new, /equipment/:id mit Zustandsaenderung.
statusTone()-Helper um Equipment-Zustaende (NEW/GOOD/WORN/DEFECTIVE)
erweitert, Nav-Dropdown um Inventar ergaenzt.

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

@@ -0,0 +1,35 @@
+import { apiFetch } from "@/lib/auth/api-client";
+import {
+  CreateEquipmentInput,
+  Equipment,
+  EquipmentFilter,
+  UpdateEquipmentInput,
+} from "./types";
+
+export function fetchEquipmentList(filter: EquipmentFilter = {}): Promise<Equipment[]> {
+  const params = new URLSearchParams();
+  if (filter.condition) params.set("condition", filter.condition);
+  const query = params.toString();
+  return apiFetch<Equipment[]>(`/equipment${query ? `?${query}` : ""}`);
+}
+
+export function fetchEquipment(id: string): Promise<Equipment> {
+  return apiFetch<Equipment>(`/equipment/${id}`);
+}
+
+export function createEquipment(input: CreateEquipmentInput): Promise<Equipment> {
+  return apiFetch<Equipment>("/equipment", {
+    method: "POST",
+    body: JSON.stringify(input),
+  });
+}
+
+export function updateEquipment(
+  id: string,
+  input: UpdateEquipmentInput,
+): Promise<Equipment> {
+  return apiFetch<Equipment>(`/equipment/${id}`, {
+    method: "PATCH",
+    body: JSON.stringify(input),
+  });
+}

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

@@ -0,0 +1,31 @@
+export type EquipmentCondition = "NEW" | "GOOD" | "WORN" | "DEFECTIVE";
+
+export interface Equipment {
+  id: string;
+  inventoryNumber: string;
+  name: string;
+  manufacturer: string | null;
+  purchaseDate: string | null;
+  condition: EquipmentCondition;
+  location: string | null;
+  maintenanceDate: string | null;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export interface CreateEquipmentInput {
+  inventoryNumber: string;
+  name: string;
+  manufacturer?: string;
+  purchaseDate?: string;
+  location?: string;
+  maintenanceDate?: string;
+}
+
+export interface UpdateEquipmentInput extends Partial<CreateEquipmentInput> {
+  condition?: EquipmentCondition;
+}
+
+export interface EquipmentFilter {
+  condition?: EquipmentCondition;
+}