feat: admin grant/revoke from admin panel

Add PUT /v1/admin/users/{id}/admin endpoint and frontend UI for
granting and revoking platform admin status. Uses atomic conditional
SQL (RevokeUserAdmin) to prevent race conditions that could remove
the last admin. Includes idempotency check, audit logging, and
confirmation dialog with self-demotion warning.

internal/api/server.go

@@ -269,6 +269,7 @@ func New(
 			r.Delete("/teams/{id}", teamH.AdminDeleteTeam)
 			r.Get("/users", usersH.AdminListUsers)
 			r.Put("/users/{id}/active", usersH.SetUserActive)
+			r.Put("/users/{id}/admin", usersH.SetUserAdmin)
 			r.Get("/audit-logs", auditH.AdminList)
 			r.Get("/templates", buildH.ListTemplates)
 			r.Delete("/templates/{name}", buildH.DeleteTemplate)