add onboarding flow with form, validation, db persistence

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/features/onboarding/schema.test.ts

@@ -0,0 +1,37 @@
+import { describe, expect, it } from "vitest";
+import { onboardingSchema } from "./schema";
+
+describe("onboardingSchema", () => {
+	it("accepts valid data", () => {
+		const result = onboardingSchema.safeParse({
+			name: "Max Mustermann",
+			plz: "10115",
+			ort: "Berlin",
+			krankenkasse: "TK",
+			aktueller_schritt: "neu",
+		});
+		expect(result.success).toBe(true);
+	});
+
+	it("rejects invalid PLZ", () => {
+		const result = onboardingSchema.safeParse({
+			name: "Max",
+			plz: "123",
+			ort: "Berlin",
+			krankenkasse: "TK",
+			aktueller_schritt: "neu",
+		});
+		expect(result.success).toBe(false);
+	});
+
+	it("rejects empty name", () => {
+		const result = onboardingSchema.safeParse({
+			name: "",
+			plz: "10115",
+			ort: "Berlin",
+			krankenkasse: "TK",
+			aktueller_schritt: "neu",
+		});
+		expect(result.success).toBe(false);
+	});
+});