rsvp_announcement: admin config (moderation, pathauto, metatag)

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Administrative configuration for the announcement content type: - Content moderation workflow (draft → review → published) - Pathauto pattern: /announcements/[node:title] or community-scoped variant - Metatag defaults (og:title, og:description from body summary) - Revision settings (keep last N revisions) - Search/Solr exclusion options (expired announcements should be excluded from search index) - Scheduled publishing integration if available