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/auth/verifyEmailToken.ts

@@ -0,0 +1,38 @@
+import { getCMS } from "@/lib/payload/getPayload";
+import { hashVerificationToken } from "@/lib/auth/verification";
+
+const TOKEN_SHAPE = /^[0-9a-f]{64}$/i;
+
+/**
+ * Verifies a token from a /auth/verify-email/[token] link: looks it up by
+ * hash (the plaintext is never stored), checks it hasn't expired, then
+ * marks the account verified and immediately clears the hash + expiry so
+ * the same link can never be used a second time.
+ */
+export async function verifyEmailToken(token: string): Promise<boolean> {
+  if (!TOKEN_SHAPE.test(token)) return false;
+
+  const payload = await getCMS();
+  const hash = hashVerificationToken(token);
+
+  const { docs } = await payload.find({
+    collection: "customers",
+    where: { emailVerificationTokenHash: { equals: hash } },
+    limit: 1,
+  });
+  const customer = docs[0];
+  if (!customer || !customer.emailVerificationExpires) return false;
+  if (new Date(customer.emailVerificationExpires).getTime() < Date.now()) return false;
+
+  await payload.update({
+    collection: "customers",
+    id: customer.id,
+    data: {
+      emailVerified: true,
+      emailVerificationTokenHash: null,
+      emailVerificationExpires: null,
+    },
+  });
+
+  return true;
+}