feat(agents): 添加 Agent 预设管理功能

- 创建 Server Agents API 路由 (CRUD + presets + defaults)
- 添加 UI Agent 类型定义和 API 客户端函数
- 实现 AgentsPanel 组件 (预设/自定义 Agent 列表)
- 实现 AgentEditor 组件 (创建/编辑 Agent)
- 实现 AgentDefaultsEditor 组件 (全局默认配置)
- 集成 AgentsPanel 到 Web 和 Desktop 应用

packages/desktop/src/App.tsx

@@ -10,6 +10,7 @@ import {
   CommandPanel,
   MCPPanel,
   HooksPanel,
+  AgentsPanel,
   Toaster,
   listSessions,
   createSession,
@@ -25,6 +26,7 @@ export function App() {
   const [showCommands, setShowCommands] = useState(false);
   const [showMCP, setShowMCP] = useState(false);
   const [showHooks, setShowHooks] = useState(false);
+  const [showAgents, setShowAgents] = useState(false);
   const [sessionTitleUpdate, setSessionTitleUpdate] = useState<{ sessionId: string; name: string } | null>(null);
 
   // 初始化：加载或创建会话
@@ -98,6 +100,7 @@ export function App() {
               onOpenCommands={() => setShowCommands(true)}
               onOpenMCP={() => setShowMCP(true)}
               onOpenHooks={() => setShowHooks(true)}
+              onOpenAgents={() => setShowAgents(true)}
             />
           ) : (
             <div className="flex-1 flex items-center justify-center h-full">
@@ -130,6 +133,9 @@ export function App() {
       {/* Hooks 面板 */}
       {showHooks && <HooksPanel onClose={() => setShowHooks(false)} />}
 
+      {/* Agents 面板 */}
+      {showAgents && <AgentsPanel onClose={() => setShowAgents(false)} />}
+
       {/* Toast 通知 */}
       <Toaster />
     </div>

packages/desktop/src/pages/Chat.tsx

@@ -3,7 +3,7 @@
  */
 
 import { useEffect, useRef } from 'react';
-import { WifiOff, MessageSquare, Settings, FolderOpen, Terminal, Plug, Zap } from 'lucide-react';
+import { WifiOff, MessageSquare, Settings, FolderOpen, Terminal, Plug, Zap, Bot } from 'lucide-react';
 import { motion, AnimatePresence } from 'framer-motion';
 import {
   useChat,
@@ -23,6 +23,7 @@ interface ChatPageProps {
   onOpenCommands?: () => void;
   onOpenMCP?: () => void;
   onOpenHooks?: () => void;
+  onOpenAgents?: () => void;
 }
 
 export function ChatPage({
@@ -34,6 +35,7 @@ export function ChatPage({
   onOpenCommands,
   onOpenMCP,
   onOpenHooks,
+  onOpenAgents,
 }: ChatPageProps) {
   const {
     messages,
@@ -127,8 +129,21 @@ export function ChatPage({
           <ConnectionStatus />
 
           {/* 工具栏按钮 */}
-          {(onOpenConfig || onToggleFileBrowser || onOpenCommands || onOpenMCP || onOpenHooks) && (
+          {(onOpenConfig || onToggleFileBrowser || onOpenCommands || onOpenMCP || onOpenHooks || onOpenAgents) && (
             <div className="flex items-center gap-1.5 border-l border-gray-600 pl-3">
+              {/* Agents 按钮 */}
+              {onOpenAgents && (
+                <motion.button
+                  whileHover={{ scale: 1.1 }}
+                  whileTap={{ scale: 0.9 }}
+                  onClick={onOpenAgents}
+                  className="p-1.5 rounded-lg text-gray-400 hover:text-gray-200 hover:bg-gray-700 transition-colors"
+                  title="Agent Presets"
+                >
+                  <Bot size={20} />
+                </motion.button>
+              )}
+
               {/* Hooks 按钮 */}
               {onOpenHooks && (
                 <motion.button