Add initial ChurchCore CMS plugin

[gltechguy954]

Summary

• add the ChurchCore CMS bootstrap with database tables, roles, statuses, and a REST summary endpoint
• implement admin menus and screens for families, people, notes, and integrations along with shared styling
• provide a front-end portal shortcode for logged-in congregants to review their records

Testing

• php -l churchcore.php
• php -l includes/class-churchcore-plugin.php
• php -l includes/class-churchcore-custom-post-types.php
• php -l includes/class-churchcore-admin-menu.php
• php -l includes/class-churchcore-integrations.php
• php -l includes/class-churchcore-shortcodes.php
• for file in includes/admin/views/*.php includes/frontend/portal.php; do php -l $file; done

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https://chatgpt.com/codex/tasks/task_e_68e5d6b7235c8322858569fae39eab49