feat(frontend): Dashboard-Ansicht (Modul 13)

/dashboard als Startseite nach Login mit Kennzahlen-Kacheln und
Hinweisen (überfällige Aufgaben, auffällige Völker, Lagerartikel
unter Mindestbestand).

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

@@ -0,0 +1,10 @@
+import { apiFetch } from "@/lib/auth/api-client";
+import { DashboardAlert, DashboardSummary } from "./types";
+
+export function fetchDashboardSummary(): Promise<DashboardSummary> {
+  return apiFetch<DashboardSummary>("/dashboard/summary");
+}
+
+export function fetchDashboardAlerts(): Promise<DashboardAlert[]> {
+  return apiFetch<DashboardAlert[]>("/dashboard/alerts");
+}

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

@@ -0,0 +1,17 @@
+export interface DashboardSummary {
+  apiariesActive: number;
+  coloniesActive: number;
+  queensActive: number;
+  openTasks: number;
+  honeyBatchesTotal: number;
+  stockItemsLowCount: number;
+}
+
+export type DashboardAlertType = "OVERDUE_TASK" | "COLONY_ATTENTION" | "LOW_STOCK";
+
+export interface DashboardAlert {
+  type: DashboardAlertType;
+  message: string;
+  relatedType: string;
+  relatedId: string;
+}