```

feat(agent): 添加对持久化子智能体的支持并增强委派管理

添加了持久化子智能体的完整生命周期管理功能，包括创建、更新、删除和查询API接口。
新增了子智能体的JSON-RPC通信协议支持，实现了远程调用和任务管理功能。

同时增强了委派管理器的功能：
- 添加了对本地委派、插件委派和本地回退的开关控制
- 实现了持久化子智能体任务的自动检测和本地执行保护
- 增加了对不同委派类型的权限验证机制

修改了智能体注册表以支持插件智能体的条件性包含，并更新了工具注册逻辑以支持可选工具。

BREAKING CHANGE: 委派管理器的构造函数签名已更改，添加了新的控制参数。
```

app-instance/frontend/lib/api.ts

@@ -27,6 +27,7 @@ import type {
   OutlookOverview,
   OutlookStatus,
   UiAgentDescriptor,
+  UiSubagentDescriptor,
   UiMcpServerDescriptor,
   WsEvent,
 } from '@/types';
@@ -631,6 +632,59 @@ export async function refreshAgents(): Promise<{ agents: UiAgentDescriptor[] }>
   return fetchJSON('/api/agents/refresh', { method: 'POST' });
 }
 
+export async function listSubagents(): Promise<UiSubagentDescriptor[]> {
+  return fetchJSON('/api/subagents');
+}
+
+export async function createSubagent(payload: {
+  id: string;
+  name?: string;
+  description?: string;
+  system_prompt?: string;
+  model?: string;
+  enabled?: boolean;
+  delegation_mode?: string;
+  allow_mcp?: boolean;
+  tags?: string[];
+  aliases?: string[];
+  mcp_servers?: Record<string, Record<string, unknown>>;
+  metadata?: Record<string, unknown>;
+}): Promise<UiSubagentDescriptor> {
+  return fetchJSON('/api/subagents', {
+    method: 'POST',
+    body: JSON.stringify(payload),
+  });
+}
+
+export async function updateSubagent(
+  subagentId: string,
+  payload: {
+    id: string;
+    name?: string;
+    description?: string;
+    system_prompt?: string;
+    model?: string;
+    enabled?: boolean;
+    delegation_mode?: string;
+    allow_mcp?: boolean;
+    tags?: string[];
+    aliases?: string[];
+    mcp_servers?: Record<string, Record<string, unknown>>;
+    metadata?: Record<string, unknown>;
+  }
+): Promise<UiSubagentDescriptor> {
+  return fetchJSON(`/api/subagents/${encodeURIComponent(subagentId)}`, {
+    method: 'PUT',
+    body: JSON.stringify(payload),
+  });
+}
+
+export async function deleteSubagent(subagentId: string): Promise<void> {
+  await fetchJSON(`/api/subagents/${encodeURIComponent(subagentId)}`, {
+    method: 'DELETE',
+  });
+}
+
 export async function cancelDelegation(runId: string): Promise<{ ok: boolean; run_id: string }> {
   return fetchJSON(`/api/delegations/${encodeURIComponent(runId)}/cancel`, {
     method: 'POST',