feat(frontend): Audit-Log-Ansicht (Modul 19)

Neue Seite /settings/audit-log (nur Administrator) mit Filter
nach Entitätstyp/-ID, Navigation um Audit-Log-Link ergaenzt.

ApiCore-Frontend/src/lib/audit-log/api.ts

@@ -0,0 +1,10 @@
+import { apiFetch } from "@/lib/auth/api-client";
+import { AuditLogEntry, AuditLogFilter } from "./types";
+
+export function fetchAuditLog(filter: AuditLogFilter = {}): Promise<AuditLogEntry[]> {
+  const params = new URLSearchParams();
+  if (filter.entityType) params.set("entityType", filter.entityType);
+  if (filter.entityId) params.set("entityId", filter.entityId);
+  const query = params.toString();
+  return apiFetch<AuditLogEntry[]>(`/audit-log${query ? `?${query}` : ""}`);
+}

ApiCore-Frontend/src/lib/audit-log/types.ts

@@ -0,0 +1,15 @@
+export interface AuditLogEntry {
+  id: string;
+  entityType: string;
+  entityId: string;
+  action: string;
+  userId: string | null;
+  timestamp: string;
+  beforeData: unknown;
+  afterData: unknown;
+}
+
+export interface AuditLogFilter {
+  entityType?: string;
+  entityId?: string;
+}