fix: 批量安装按钮检测 + 审计日志中文化 + terminal断开反馈

1. updateBatchBar() hasAgent 判断从 agent_api_key_set 改为 agent_version
2. 所有后端 AuditLog detail 字段统一中文
3. audit.html 操作/目标类型中文映射
4. terminal.html 断开覆盖层 + 重新连接按钮
5. Agent os_release 上报 + 前端系统版本拆分

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

server/api/agent.py

@@ -319,8 +319,8 @@ async def script_job_callback(
         target_type="script_execution",
         target_id=result["execution_id"],
         detail=(
-            f"server_id={payload.server_id} job_id={payload.job_id} "
-            f"exit_code={payload.exit_code} status={result.get('status')}"
+            f"服务器ID={payload.server_id} 任务ID={payload.job_id} "
+            f"退出码={payload.exit_code} 状态={result.get('status')}"
         ),
     ))