feat: v3.0 Tool Calling — AI 本地文件操作系统

新增文件:
- src/main/tool-security.ts: 路径白名单/黑名单、命令安全检查
- src/main/tool-handlers.ts: 7个工具实现(read/write/list/search/create/delete/run)
- src/renderer/services/tool-registry.ts: 工具注册调度中心
- src/renderer/services/agent-engine.ts: Agent Loop 流式多轮工具调用引擎
- src/renderer/components/tool-confirm-modal.ts: 高风险操作确认对话框

修改文件:
- types.d.ts: 新增 ToolCall/ToolResult/ToolCallRecord 等类型
- ollama.ts: chatStream 支持 tools 参数
- ipc.ts: 新增 tool:execute/getConfig/setAllowedDirs IPC
- preload.ts: 暴露 tool API
- chat-area.ts: 渲染工具调用卡片
- input-area.ts: 集成 Agent Loop 引擎
- settings-modal.ts: 工具调用开关设置
- index.html: 工具调用设置面板 + 确认对话框 HTML
- style.css: 工具调用卡片、确认对话框样式
- main.ts: 初始化工具调用配置

src/main/ipc.ts

@@ -7,6 +7,16 @@ import * as fs from 'fs';
 import * as path from 'path';
 import { mainWindow } from './main.js';
 import { showNotification } from './utils.js';
+import {
+  handleReadFile,
+  handleWriteFile,
+  handleListDir,
+  handleSearchFiles,
+  handleCreateDir,
+  handleDeleteFile,
+  handleRunCommand
+} from './tool-handlers.js';
+import { getAllowedDirs, getBlockedDirs, setAllowedDirs } from './tool-security.js';
 
 export function setupIPC(): void {
   ipcMain.handle('dialog:openFile', async (_, options?: { filters?: Array<{ name: string; extensions: string[] }> }) => {
@@ -69,4 +79,27 @@ export function setupIPC(): void {
       shell.openExternal(url);
     }
   });
+
+  // ── Tool Calling IPC ──
+  ipcMain.handle('tool:execute', async (_, toolName: string, args: Record<string, unknown>) => {
+    switch (toolName) {
+      case 'read_file':          return handleReadFile(args as { path: string; encoding?: string; start_line?: number; end_line?: number });
+      case 'write_file':         return handleWriteFile(args as { path: string; content: string; encoding?: string });
+      case 'list_directory':     return handleListDir(args as { path: string; recursive?: boolean; max_depth?: number; include_hidden?: boolean; filter_extension?: string });
+      case 'search_files':       return handleSearchFiles(args as { path: string; query: string; search_type?: string; case_sensitive?: boolean; max_results?: number; file_extensions?: string[] });
+      case 'create_directory':   return handleCreateDir(args as { path: string });
+      case 'delete_file':        return handleDeleteFile(args as { path: string; recursive?: boolean });
+      case 'run_command':        return handleRunCommand(args as { command: string; cwd?: string; timeout?: number });
+      default:                   return { success: false, error: `未知工具: ${toolName}` };
+    }
+  });
+
+  ipcMain.handle('tool:getConfig', () => ({
+    allowedDirs: getAllowedDirs(),
+    blockedDirs: getBlockedDirs()
+  }));
+
+  ipcMain.handle('tool:setAllowedDirs', (_, dirs: string[]) => {
+    setAllowedDirs(dirs);
+  });
 }