fix: LLM 工具循环 400、中断消息注入、ConPTY 终端支持

- agent: 工具轮请求尾部补 user 占位(zen 网关强制),tool 消息正确配对
- agent: 工具提醒/中断以 system 角色注入并带 [中断消息] 前缀,不进用户履历;系统提示词说明中断消息格式
- agentcli: 基于 ConPTY 的交互式终端(ptywin fork),terminal_create/read/write/resize/close/watch
- webui: server 输出通道适配器(保留 reasoning_content/disable_thinking)
- GUI: 沉浸式标题栏、icon 圆角重制、mascot 等打磨

cmd/gui/preload.js

@@ -1,6 +1,11 @@
 const { contextBridge, ipcRenderer } = require('electron');
 
 contextBridge.exposeInMainWorld('homeagent', {
+  win: {
+    minimize: () => ipcRenderer.invoke('window:minimize'),
+    toggleMaximize: () => ipcRenderer.invoke('window:toggleMaximize'),
+    close: () => ipcRenderer.invoke('window:close'),
+  },
   connections: {
     list: () => ipcRenderer.invoke('connections:list'),
     add: (conn) => ipcRenderer.invoke('connections:add', conn),
@@ -8,4 +13,7 @@ contextBridge.exposeInMainWorld('homeagent', {
     delete: (id) => ipcRenderer.invoke('connections:delete', id),
     setCurrent: (id) => ipcRenderer.invoke('connections:setCurrent', id),
   },
+  cli: {
+    request: (socketPath, apiKey, line) => ipcRenderer.invoke('cli:request', { socketPath, apiKey, line }),
+  },
 });