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>

lib/email/bookingTemplates.ts

@@ -98,7 +98,7 @@ export function bookingRejectedEmail(args: BaseArgs): { subject: string; html: s
         { label: "Datum", value: args.dateLabel },
         { label: "Uhrzeit", value: args.timeLabel },
       ]),
-      paragraph("Melde dich gerne für einen neuen Termin — schau einfach wieder in deinem ANOUMA-Konto vorbei.", { small: true }),
+      paragraph("Melde dich gerne für einen neuen Termin — schau einfach wieder in deinem Konto vorbei.", { small: true }),
     ].join("\n"),
   });
   return { subject: "Deine Terminanfrage bei ANOUMA", html };