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/lib/apiClient.ts

@@ -28,14 +28,6 @@ apiClient.interceptors.request.use(async (config) => {
     config.headers["X-Tenant-ID"] = tenantId;
   }
 
-  // [Development Only] Inject Mock Role from RoleSwitcher
-  const isMockRoleEnabled =
-    window.localStorage.getItem("X-Mock-Role-Enabled") === "true";
-  const mockRole = window.localStorage.getItem("X-Mock-Role");
-  if (isMockRoleEnabled && mockRole) {
-    config.headers["X-Test-Role"] = mockRole;
-  }
-
   return config;
 });