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/seo/textExcerpt.ts

@@ -0,0 +1,32 @@
+type LexicalNode = { text?: string; children?: LexicalNode[] };
+
+function collectText(node: LexicalNode, out: string[]): void {
+  if (typeof node.text === "string" && node.text) out.push(node.text);
+  if (Array.isArray(node.children)) {
+    for (const child of node.children) collectText(child, out);
+  }
+}
+
+/** Walks a Lexical richText field's JSON (any node shape) and extracts plain text, regardless of formatting/links/lists used. */
+export function plainTextFromRichText(data: unknown): string {
+  if (!data || typeof data !== "object") return "";
+  const root = (data as { root?: LexicalNode }).root;
+  if (!root) return "";
+  const parts: string[] = [];
+  collectText(root, parts);
+  return parts.join(" ").replace(/\s+/g, " ").trim();
+}
+
+/** Truncates at a word boundary rather than mid-word, for a natural-reading meta description fallback. */
+export function excerpt(text: string, maxLength = 160): string {
+  const clean = text.replace(/\s+/g, " ").trim();
+  if (clean.length <= maxLength) return clean;
+  const truncated = clean.slice(0, maxLength);
+  const lastSpace = truncated.lastIndexOf(" ");
+  const safe = lastSpace > maxLength * 0.6 ? truncated.slice(0, lastSpace) : truncated;
+  return `${safe.trim()}…`;
+}
+
+export function excerptFromRichText(data: unknown, maxLength = 160): string {
+  return excerpt(plainTextFromRichText(data), maxLength);
+}