feat: simplify RBAC roles and remove dev role switcher

- Simplified RBAC system to two roles: super_admin and user.
- Removed tenant_admin and rp_admin roles across backend and frontend.
- Removed Dev Role Switcher feature from adminfront.
- Updated all handlers, middlewares, and navigation to reflect the new role model.
- Fixed backend build errors and updated tests.

adminfront/src/features/users/UserDetailPage.tsx

@@ -468,8 +468,7 @@ function UserDetailPage() {
   });
 
   const profileRole = normalizeAdminRole(profile?.role);
-  const isAdmin =
-    profileRole === "super_admin" || profileRole === "tenant_admin";
+  const isAdmin = profileRole === "super_admin";
   const isSelf = Boolean(profile?.id && user?.id && profile.id === user.id);
   const watchedStatus = watch("status");