feat: contacts and voucher assignment

tests/contacts-validate.test.ts

@@ -0,0 +1,13 @@
+import { describe, it, expect } from "vitest";
+import { validateContact } from "../lib/contacts";
+describe("validateContact", () => {
+  it("braucht mindestens einen Kanal", () => {
+    expect(validateContact({ name: "Mama", email: null, telegramChatId: null })).toContain("kanal");
+  });
+  it("lehnt ungültige Mail ab", () => {
+    expect(validateContact({ name: "Mama", email: "keine-mail", telegramChatId: null })).toContain("email");
+  });
+  it("akzeptiert nur Telegram", () => {
+    expect(validateContact({ name: "Papa", email: null, telegramChatId: "12345" })).toEqual([]);
+  });
+});