feat(ccw): 添加 ccw tool exec 工具系统

新增工具:
- edit_file: AI辅助文件编辑 (update/line模式)
- get_modules_by_depth: 项目结构分析
- update_module_claude: CLAUDE.md文档生成
- generate_module_docs: 模块文档生成
- detect_changed_modules: Git变更检测
- classify_folders: 文件夹分类
- discover_design_files: 设计文件发现
- convert_tokens_to_css: 设计token转CSS
- ui_generate_preview: UI预览生成
- ui_instantiate_prototypes: 原型实例化

使用方式:
  ccw tool list              # 列出所有工具
  ccw tool exec <name> '{}'  # 执行工具

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ccw/src/cli.js

@@ -6,6 +6,7 @@ import { installCommand } from './commands/install.js';
 import { uninstallCommand } from './commands/uninstall.js';
 import { upgradeCommand } from './commands/upgrade.js';
 import { listCommand } from './commands/list.js';
+import { toolCommand } from './commands/tool.js';
 import { readFileSync, existsSync } from 'fs';
 import { fileURLToPath } from 'url';
 import { dirname, join } from 'path';
@@ -105,5 +106,11 @@ export function run(argv) {
     .description('List all installed Claude Code Workflow instances')
     .action(listCommand);
 
+  // Tool command
+  program
+    .command('tool [subcommand] [args] [json]')
+    .description('Execute CCW tools')
+    .action((subcommand, args, json) => toolCommand(subcommand, args, { json }));
+
   program.parse(argv);
 }