Add email verification, personal calendar feed, and full SEO implementation

- Customer accounts now require email verification (hashed, single-use,
  time-limited tokens) before they can request/confirm bookings, with
  resend flows on login/account/booking widget and rate limiting.
- Admins get a private, rotatable iCalendar (ICS) subscription feed of
  their confirmed bookings and public events, timezone-correct for
  Europe/Berlin including DST, never exposing meeting passwords.
- Adds a full SEO layer: per-page canonical/OG/Twitter metadata with
  CMS-editable overrides and content-derived fallbacks, a dynamic
  sitemap.xml and robots.txt driven by real published content, JSON-LD
  (Organization/LocalBusiness, WebSite, WebPage, BreadcrumbList, Service,
  Event, BlogPosting) that never fabricates data, and a CMS-managed
  redirect table for changed slugs.
- Global ANOUMA-naming audit: the brand name is never used to label
  personal account/calendar areas anywhere in the app, CMS, or emails.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app/(frontend)/angebote/singkreise/page.tsx

@@ -7,13 +7,18 @@ import { Reveal } from "@/components/Reveal";
 import { getOffers } from "@/lib/payload/content";
 import { moodForOffer } from "@/lib/angebote";
 import { mediaUrl } from "@/lib/payload/media";
+import { buildMetadata } from "@/lib/seo/metadata";
+import { siteConfig } from "@/lib/site";
 
 export const dynamic = "force-dynamic";
 
-export const metadata: Metadata = {
-  title: "Singkreise",
-  description: "Gemeinsam singen. Verbinden. Heilen. Für Herz und Seele.",
-};
+export async function generateMetadata(): Promise<Metadata> {
+  return buildMetadata({
+    title: `Singkreise – ${siteConfig.name}`,
+    description: "Gemeinsam singen. Verbinden. Heilen. Für Herz und Seele.",
+    path: "/angebote/singkreise",
+  });
+}
 
 export default async function SingkreisePage() {
   const offers = await getOffers();