feat: 新增管理后台前端项目及安全加固

refactor(saas): 重构认证中间件与限流策略
- 登录限流调整为5次/分钟/IP
- 注册限流调整为3次/小时/IP
- GET请求不计入限流

fix(saas): 修复调度器时间戳处理
- 使用NOW()替代文本时间戳
- 兼容TEXT和TIMESTAMPTZ列类型

feat(saas): 实现环境变量插值
- 支持${ENV_VAR}语法解析
- 数据库密码支持环境变量注入

chore: 新增前端管理界面
- 基于React+Ant Design Pro
- 包含路由守卫/错误边界
- 对接58个API端点

docs: 更新安全加固文档
- 新增密钥管理规范
- 记录P0安全项审计结果
- 补充TLS终止说明

test: 完善配置解析单元测试
- 新增环境变量插值测试用例

crates/zclaw-kernel/src/director.rs

@@ -1,10 +1,15 @@
-//! Director - Multi-Agent Orchestration
+//! Director - Multi-Agent Orchestration (Experimental)
 //!
 //! The Director manages multi-agent conversations by:
 //! - Determining which agent speaks next
 //! - Managing conversation state and turn order
 //! - Supporting multiple scheduling strategies
 //! - Coordinating agent responses
+//!
+//! **Status**: This module is fully implemented but gated behind the `multi-agent` feature.
+//! The desktop build does not currently enable this feature. When multi-agent support
+//! is ready for production, add Tauri commands to create and interact with the Director,
+//! and enable the feature in `desktop/src-tauri/Cargo.toml`.
 
 use std::sync::Arc;
 use serde::{Deserialize, Serialize};