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/TenantListPage.tsx

@@ -528,11 +528,7 @@ function TenantListPage() {
     return () => window.removeEventListener("message", onMessage);
   }, [allTenants, scopePickerOpen]);
 
-  if (
-    profile &&
-    profileRole !== "super_admin" &&
-    profileRole !== "tenant_admin"
-  ) {
+  if (profile && profileRole !== "super_admin") {
     return (
       <div className="flex h-[50vh] flex-col items-center justify-center space-y-4">
         <h3 className="text-lg font-bold">
@@ -545,13 +541,6 @@ function TenantListPage() {
     );
   }
 
-  if (
-    profileRole === "tenant_admin" &&
-    (profile?.manageableTenants?.length ?? 0) <= 1
-  ) {
-    return null;
-  }
-
   const handleSelectAll = (checked: boolean) => {
     if (checked) {
       setSelectedIds(deletableTenants.map((t) => t.id));