refactor(2meet-data-optimizer): stop registering the sso group in core

- TMDO_Member_Fields no longer registers user/sso; the definition moved
  unchanged (hash 03543f19) to 2meet-data-optimizer-sso-addon.
- missing_integration_addons(): 2meet-hub-core or 2meet-spoke-sso without
  the SSO AddOn is reported (admin notice + Site Health).
- The deprecated-AddOn notice points hub / spoke users to the SSO AddOn.
- Sites must activate the SSO AddOn before this ships (PR-041); aeav_only
  sites without it fall back to orphan-group restore.
- Verify: core unit 659 / integration 475, SSO 6, HP 142/49, WC 10/22
  green, phpcs clean
- PR: PR-040

admin/class-tmdo-deprecated-addons-notice.php

@@ -6,7 +6,8 @@
  * mobile-bridge, playlist, quotation, spoke) only registered tables and fields
  * on the partner's behalf. Partner plugins now register themselves with the
  * TMDO_Anti_EAV_Aware trait (docs/PARTNER-REGISTRATION.md), so these AddOns
- * are deprecated and will be removed.
+ * are deprecated and will be removed. The hub and spoke AddOns are replaced
+ * by 2meet-data-optimizer-sso-addon.
  *
  * @package WP_Data_Optimizer
  */
@@ -79,5 +80,11 @@ final class TMDO_Deprecated_Addons_Notice {
 			),
 			esc_html__( '改寫方式見 2meet-data-optimizer 外掛內的 docs/PARTNER-REGISTRATION.md；partner 外掛完成自行註冊後即可停用對應 AddOn。', '2meet-data-optimizer' )
 		);
+		if ( array_intersect( $active, array( 'hub', 'spoke' ) ) ) {
+			printf(
+				'<div class="notice notice-warning"><p>%s</p></div>',
+				esc_html__( 'Hub / Spoke AddOn 由 2meet-data-optimizer-sso-addon 取代：啟用它之後即可停用這兩個 AddOn。', '2meet-data-optimizer' )
+			);
+		}
 	}
 }