Initial upload of BB-Apartment 2026 website.

Adds the complete Next.js website including i18n routing, house and
apartment pages, Beds24 v2 integration for live availability/pricing,
Stripe checkout, contact forms, Docker setup and deployment docs.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

i18n.ts

@@ -0,0 +1,17 @@
+import { getRequestConfig } from "next-intl/server";
+import { notFound } from "next/navigation";
+
+export const locales = ["de", "en"] as const;
+export type Locale = (typeof locales)[number];
+export const defaultLocale: Locale = "de";
+
+export default getRequestConfig(async ({ requestLocale }) => {
+  const locale = await requestLocale;
+
+  if (!locale || !locales.includes(locale as Locale)) notFound();
+
+  return {
+    locale: locale as string,
+    messages: (await import(`./messages/${locale}.json`)).default,
+  };
+});