refactor(2meet-data-optimizer): retire the SSO AddOn recommendation

- missing_integration_addons() no longer asks for the SSO AddOn when
  2meet-hub-core / 2meet-spoke-sso are active: they register their own
  tables and the `sso` values belong in usermeta (benchmark: no
  measurable gain from the flat table for by-user-id access).
- `sso` joins the deprecated AddOns; for hub / spoke / sso the notice says
  they go without replacement and to run
  `wp tmdo bridge-restore-native user --group=sso --retire` first.
- Verify: core unit 658 / integration 479 green, phpcs clean
- PR: PR-043

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

@@ -6,8 +6,9 @@
  * 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. The hub and spoke AddOns are replaced
- * by 2meet-data-optimizer-sso-addon.
+ * are deprecated and will be removed. The SSO data needs no AddOn at all:
+ * the hub, spoke and SSO AddOns go without replacement (the `sso` group gave
+ * no measurable gain over usermeta) once its values are written back.
  *
  * @package WP_Data_Optimizer
  */
@@ -24,7 +25,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 final class TMDO_Deprecated_Addons_Notice {
 
 	/** In-house plugins whose AddOn is replaced by partner self-registration. */
-	private const SLUGS = array( 'bookings', 'collab', 'hub', 'infocards', 'mobile-bridge', 'playlist', 'quotation', 'spoke' );
+	private const SLUGS = array( 'bookings', 'collab', 'hub', 'infocards', 'mobile-bridge', 'playlist', 'quotation', 'spoke', 'sso' );
 
 	/**
 	 * Hook the notice.
@@ -80,10 +81,10 @@ 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' ) ) ) {
+		if ( array_intersect( $active, array( 'hub', 'spoke', 'sso' ) ) ) {
 			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' )
+				esc_html__( 'Hub / Spoke / SSO AddOn 不需替代：2meet-hub-core 與 2meet-spoke-sso 會自行註冊資料表，SSO 值存回 usermeta 即可。停用前先執行 wp tmdo bridge-restore-native user --group=sso --retire。', '2meet-data-optimizer' )
 			);
 		}
 	}