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>

components/admin/CalendarFeedPanel.tsx

@@ -0,0 +1,93 @@
+"use client";
+
+import { useState } from "react";
+import styles from "./CalendarFeedPanel.module.css";
+
+export function CalendarFeedPanel({ initiallyConfigured }: { initiallyConfigured: boolean }) {
+  const [configured, setConfigured] = useState(initiallyConfigured);
+  const [loading, setLoading] = useState(false);
+  const [url, setUrl] = useState<string | null>(null);
+  const [copied, setCopied] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+
+  async function generate() {
+    setLoading(true);
+    setError(null);
+    setCopied(false);
+    try {
+      const res = await fetch("/api/admin/calendar-feed/regenerate", { method: "POST", credentials: "include" });
+      const data = await res.json().catch(() => ({}));
+      if (!res.ok) {
+        setError(data.error || "Der Kalender-Link konnte nicht erzeugt werden.");
+        return;
+      }
+      setUrl(data.url);
+      setConfigured(true);
+    } catch {
+      setError("Verbindung fehlgeschlagen.");
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  async function copy() {
+    if (!url) return;
+    try {
+      await navigator.clipboard.writeText(url);
+      setCopied(true);
+    } catch {
+      // Clipboard API can be unavailable (e.g. insecure context) — the
+      // input is still selectable/copyable by hand in that case.
+    }
+  }
+
+  return (
+    <div className={styles.panel}>
+      <h2 className={styles.heading}>Kalender synchronisieren</h2>
+      <p className={styles.hint}>
+        Abonniere deinen persönlichen Kalender in Apple Kalender, Google Kalender, Outlook, Thunderbird oder einer
+        anderen iCalendar-kompatiblen App. Der Link enthält ein geheimes Zugriffstoken — teile ihn nicht.
+      </p>
+
+      {!url && (
+        <p className={styles.status}>
+          {configured ? "Ein Kalender-Link ist eingerichtet." : "Es ist noch kein Kalender-Link eingerichtet."}
+        </p>
+      )}
+
+      {!url && (
+        <button type="button" className={styles.button} onClick={generate} disabled={loading}>
+          {loading ? "Wird erzeugt …" : configured ? "Kalender-Link neu generieren" : "Kalender-Link generieren"}
+        </button>
+      )}
+
+      {error && <p className={styles.error}>{error}</p>}
+
+      {url && (
+        <div className={styles.result}>
+          <p className={styles.resultWarning}>Wird nur jetzt einmal angezeigt — bitte gleich kopieren.</p>
+          <div className={styles.urlRow}>
+            <input className={styles.urlInput} type="text" readOnly value={url} onFocus={(e) => e.currentTarget.select()} />
+            <button type="button" className={styles.secondaryButton} onClick={copy}>
+              Kopieren
+            </button>
+          </div>
+          {copied && <p className={styles.copied}>In die Zwischenablage kopiert.</p>}
+          <button type="button" className={styles.secondaryButton} style={{ marginTop: 12 }} onClick={generate} disabled={loading}>
+            {loading ? "Wird erzeugt …" : "Kalender-Link neu generieren"}
+          </button>
+        </div>
+      )}
+
+      <p className={styles.instructions}>
+        <strong>Apple Kalender:</strong> Ablage → Neues Kalenderabonnement → Link einfügen.
+        <br />
+        <strong>Google Kalender:</strong> Weitere Kalender „+“ → Per URL → Link einfügen.
+        <br />
+        <strong>Outlook:</strong> Kalender hinzufügen → Aus dem Internet abonnieren → Link einfügen.
+        <br />
+        <strong>Thunderbird:</strong> Kalender → Neuer Kalender → Im Netzwerk → Link einfügen.
+      </p>
+    </div>
+  );
+}