CFG-04: benachrichtigungs-einstellungen-oberflaeche (handler+tests fuer notifyprefs, web/notifications next.js-frontend auf shl-01)

web/notifications/lib/api.ts

@@ -0,0 +1,45 @@
+const API_BASE = process.env.NEXT_PUBLIC_CORE_API_BASE ?? "";
+
+export class ApiError extends Error {}
+
+async function req<T>(path: string, init?: RequestInit): Promise<T> {
+  const res = await fetch(`${API_BASE}${path}`, {
+    credentials: "include",
+    headers: init?.body ? { "Content-Type": "application/json" } : undefined,
+    ...init,
+  });
+  const data = await res.json().catch(() => ({}));
+  if (!res.ok) {
+    throw new ApiError(data.error ?? data.message ?? "Unbekannter Fehler");
+  }
+  return data as T;
+}
+
+export interface Preference {
+  TenantSlug: string;
+  UserID: string;
+  EventType: string;
+  Channel: string;
+  Enabled: boolean;
+}
+
+// Bekannte Ereignistypen/Kanäle — das Backend erzwingt keine feste Liste
+// (jedes Modul kann eigene event_type-Werte an EnqueueIfAllowed übergeben),
+// diese Liste ist der aktuell bekannte Stand fürs Frontend-Formular.
+export const KNOWN_EVENT_TYPES = ["welcome", "invoice_ready", "password_reset", "security_alert"] as const;
+export const KNOWN_CHANNELS = ["email", "in_app"] as const;
+
+export function fetchMyPreferences(): Promise<Preference[]> {
+  return req("/notifications/preferences");
+}
+
+export function setPreference(eventType: string, channel: string, enabled: boolean): Promise<void> {
+  return req("/notifications/preferences", {
+    method: "POST",
+    body: JSON.stringify({ event_type: eventType, channel, enabled }),
+  });
+}
+
+export function fetchTenantOverview(): Promise<Preference[]> {
+  return req("/notifications/preferences/tenant");
+}