feat(admin): archive users and their profiles permanently

backend/tests/mcpDocuments.test.ts

@@ -151,6 +151,7 @@ test("HTTP MCP accepts uploads above 1 MiB and streams authorized PDFs without e
             return { rows: [[id, 7, id, true, null, "test@example.invalid", admin]] }
         }
         if (sql.startsWith('update "m2m_api_keys"')) return { rows: [] }
+        if (sql.includes('from "auth_users"')) return { rows: [[admin]] }
         if (sql.includes('from "tenants"')) return { rows: [[null, null]] }
         if (sql.includes('from "auth_user_roles"')) return { rows: [[id]] }
         if (sql.includes('from "auth_role_permissions"')) return { rows: [] }