Der Eine.: add Testimonials + closing Pricing CTA, reorder PasstDazu last

Testimonials now pulled from Payload (page: "der-eine", same collection
as todo-cards/newsletter/challenge) instead of a hardcoded array. Pricing
adds a second, final buy CTA (same image+price+button card as the other
product pages' Pricing.tsx) for visitors who scroll past Hero's button.
PasstDazu moves to right before the Footer.

app/der-eine/page.tsx

@@ -2,6 +2,8 @@ import type { Metadata } from "next";
 import { Hero } from "./components/Hero";
 import { Focus } from "./components/Focus";
 import { PasstDazu } from "./components/PasstDazu";
+import { Testimonials } from "./components/Testimonials";
+import { Pricing } from "./components/Pricing";
 import { Footer } from "../components/Footer";
 import { getProductBySlug, getCompanySettings } from "../lib/payload";
 import { buildProductSchema } from "../lib/structuredData";
@@ -44,6 +46,8 @@ export default async function DerEinePage() {
       <main className="flex flex-col flex-1">
         <Hero />
         <Focus />
+        <Testimonials />
+        <Pricing />
         <PasstDazu productSlug="stift-kugelschreiber" />
       </main>
       <Footer />