Add owner role and admin management controls

wwwroot/data/i18n/faq/en.md

@@ -15,6 +15,7 @@ Your display name is required ‒ it appears next to all of your suggestions and
 
 If you've been given an **admin key**, enter it during registration. If the key is invalid, the request is rejected.
 Admin-key bootstrap is only available until the first admin account exists. Admin access cannot be added later. To become an admin afterward, an existing admin must create/manage access outside the public registration flow.
+Once an owner account exists, the registration form no longer shows the admin-key field.
 
 ## Phases at a Glance
 
@@ -156,6 +157,7 @@ No. Suggestions and votes are read-only. Contact an admin for assistance.
 -   Grant jokers during Vote
 -   Move a voter back to Suggest (stronger than a joker; use sparingly)
  -   Toggle results access with a single button (label switches by current state)
+-   Grant or revoke admin role for any non-owner account from the player table
 -   Link or unlink duplicate suggestions
 -   Delete suggestions
 -   View vote readiness (who has finalized)
@@ -167,6 +169,7 @@ No. Suggestions and votes are read-only. Contact an admin for assistance.
 ### What can't admin accounts do?
 
 -   View individual player votes
+-   Revoke owner permissions or delete the owner account
 
 Voting remains anonymous and fair.