feat: mail telegram and cron check

tests/notify.test.ts

@@ -0,0 +1,17 @@
+// tests/notify.test.ts
+import { describe, it, expect, vi } from "vitest";
+describe("notify message", () => {
+  it("baut Erinnerungstext mit Restbetrag", async () => {
+    const { buildReminderText } = await import("../lib/notify-text");
+    expect(buildReminderText({ name: "Therme", restCents: 2550, ablaufdatum: "01.12.2026" })).toContain("25,50");
+  });
+  it("sendTelegram ruft Bot-API mit chat_id", async () => {
+    const fetchMock = vi.fn().mockResolvedValue({ ok: true, json: async () => ({ ok: true }) });
+    vi.stubGlobal("fetch", fetchMock);
+    const { sendTelegram } = await import("../lib/telegram");
+    process.env.TELEGRAM_BOT_TOKEN = "test-token";
+    await sendTelegram("123", "hallo");
+    expect(fetchMock).toHaveBeenCalledWith(expect.stringContaining("test-token"), expect.anything());
+    vi.unstubAllGlobals();
+  });
+});