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/tenants/routes/TenantSchemaPage.tsx

@@ -34,8 +34,7 @@ export function TenantSchemaPage() {
   });
 
   const profileRole = normalizeAdminRole(profile?.role);
-  const canAccess =
-    profileRole === "super_admin" || profileRole === "tenant_admin";
+  const canAccess = profileRole === "super_admin";
 
   const tenantQuery = useQuery({
     queryKey: ["tenant", tenantId],