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.

devfront/src/features/developer-access/developerAccessGate.ts

@@ -12,11 +12,7 @@ export type DeveloperAccessGateState = {
 };
 
 function isPrivilegedDeveloperRole(profileRole: string) {
-  return (
-    profileRole === "super_admin" ||
-    profileRole === "tenant_admin" ||
-    profileRole === "rp_admin"
-  );
+  return profileRole === "super_admin";
 }
 
 export function resolveDeveloperAccessGate(