<ul><li>Built /modules/ContactUsManager/ following the standardized module architecture (module_id=31)</li><li>Created all required contexts: tenant_admin (active), platform_admin, tenant_member, tenant_public, api (stubs)</li><li>Copied all legacy page files into module: list_emails_data.php, email_information.php, email_contact_information.php, categories.php, categories/table_categories.php, update_emails.php, get_message.php, custom_code.php, preview_page.php</li><li>Copied inc/insert_update.php into module — replaced chdir(../../) with DOCUMENT_ROOT-based absolute path; defined __CONTACTMODULEID=31 locally</li><li>Copied js/custom_js.php — changed let to var for all cross-block globals; updated AJAX URL from legacy path to /modules/ContactUsManager/inc/insert_update.php</li><li>PHP 8.1 fixes: null coalescing on all field echoes; htmlspecialchars() on all output; fixed preview_page.php ternary warning; removed chdir from get_message.php</li><li>Applied isadmin=1 forcing in inc_contactus_tenant_admin.php (required for /modules/ URL path)</li><li>Verified: 0 PHP errors, all 5 tabs loading with live data (messages, page info, contact info, categories, settings)</li><li>Legacy system untouched and fully functional at original path</li><li>Screenshots: legacy vs new comparison completed — all tabs match</li></ul>