Put opening hours, service area and FAQ into the structured data

Settings gain opening hours per weekday and a list of places served;
LocalBusiness emits openingHoursSpecification (equal times grouped) and
areaServed. An accordion can be marked as FAQ (schema v23 property
`faq`), which turns its entries into a FAQPage built from the visible
title and text blocks. Elektro Bernhard gets the real office hours
(Mo–Fr 07:30–17:00), the service area from Karlsruhe to Offenburg and
two more questions. ADR 094.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

src/Content/DocumentValidator.php

@@ -251,6 +251,11 @@ final class DocumentValidator
         if ('spacer' === $type) {
             $this->require(in_array($props['size'] ?? null, self::SPACER_SIZES, true), 'Unknown spacer size.');
         }
+        if ('accordion' === $type && array_key_exists('faq', $props)) {
+            // Ein Akkordeon ist nicht automatisch eine FAQ; erst die Kennzeichnung macht aus den
+            // Einträgen Frage-Antwort-Paare in den strukturierten Daten.
+            $this->require($schemaVersion >= 23 && is_bool($props['faq']), 'Die FAQ-Kennzeichnung ist an oder aus und braucht Schema v23.');
+        }
         if ('accordionitem' === $type) {
             $this->text($props['title'] ?? null, 160);
             $this->require(is_bool($props['open'] ?? false), 'The open state is a boolean.');