feat(skill-execution): implement execute_skill tool with full execution chain

- Add ExecuteSkillTool for LLM to call skills during conversation
- Implement SkillExecutor trait in Kernel for skill execution
- Update AgentLoop to support tool execution with skill_executor
- Add default skills_dir configuration in KernelConfig
- Connect frontend skillMarketStore to backend skill_list command
- Update technical documentation with Skill system architecture

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

desktop/src/store/skillMarketStore.ts

@@ -235,98 +235,47 @@ export const useSkillMarketStore = create<SkillMarketState & SkillMarketActions>
 
 /**
  * 扫描 skills 目录获取可用技能
+ * 从后端获取技能列表
  */
 async function scanSkillsDirectory(): Promise<Skill[]> {
-  // 这里我们模拟扫描，实际实现需要通过 Tauri API 访问文件系统
-  // 或者从预定义的技能列表中加载
-  const skills: Skill[] = [
-    // 开发类
-    {
-      id: 'code-review',
-      name: '代码审查',
-      description: '审查代码、分析代码质量、提供改进建议',
-      triggers: ['审查代码', '代码审查', 'code review', 'PR Review', '检查代码', '分析代码'],
-      capabilities: ['代码质量分析', '架构评估', '最佳实践检查', '安全审计'],
-      toolDeps: ['read', 'grep', 'glob'],
-      category: 'development',
-      installed: false,
-      tags: ['代码', '审查', '质量'],
-    },
-    {
-      id: 'translation',
-      name: '翻译助手',
-      description: '翻译文本、多语言转换、保持语言风格一致性',
-      triggers: ['翻译', 'translate', '中译英', '英译中', '翻译成', '转换成'],
-      capabilities: ['多语言翻译', '技术文档翻译', '代码注释翻译', 'UI 文本翻译', '风格保持'],
-      toolDeps: ['read', 'write'],
-      category: 'content',
-      installed: false,
-      tags: ['翻译', '语言', '国际化'],
-    },
-    {
-      id: 'chinese-writing',
-      name: '中文写作',
-      description: '中文写作助手 - 帮助撰写各类中文文档、文章、报告',
-      triggers: ['写一篇', '帮我写', '撰写', '起草', '润色', '中文写作'],
-      capabilities: ['撰写文档', '润色修改', '调整语气', '中英文翻译'],
-      toolDeps: ['read', 'write'],
-      category: 'content',
-      installed: false,
-      tags: ['写作', '文档', '中文'],
-    },
-    {
-      id: 'web-search',
-      name: '网络搜索',
-      description: '搜索互联网信息、整合多方来源',
-      triggers: ['搜索', 'search', '查找信息', '查询', '搜索网络'],
-      capabilities: ['搜索引擎集成', '信息提取', '来源验证', '结果整合'],
-      toolDeps: ['web_search'],
-      category: 'research',
-      installed: false,
-      tags: ['搜索', '互联网', '信息'],
-    },
-    {
-      id: 'data-analysis',
-      name: '数据分析',
-      description: '数据清洗、统计分析、可视化图表',
-      triggers: ['数据分析', '统计', '可视化', '图表', 'analytics'],
-      capabilities: ['数据清洗', '统计分析', '可视化图表', '报告生成'],
-      toolDeps: ['read', 'write', 'shell'],
-      category: 'analytics',
-      installed: false,
-      tags: ['数据', '分析', '可视化'],
-    },
-    {
-      id: 'git',
-      name: 'Git 操作',
-      description: 'Git 版本控制操作、分支管理、冲突解决',
-      triggers: ['git', '版本控制', '分支', '合并', 'commit', 'merge'],
-      capabilities: ['分支管理', '冲突解决', 'rebase', 'cherry-pick'],
-      toolDeps: ['shell'],
-      category: 'development',
-      installed: false,
-      tags: ['git', '版本控制', '分支'],
-    },
-    {
-      id: 'shell-command',
-      name: 'Shell 命令',
-      description: '执行 Shell 命令、系统操作',
-      triggers: ['shell', '命令行', '终端', 'terminal', 'bash'],
-      capabilities: ['命令执行', '管道操作', '脚本运行', '环境管理'],
-      toolDeps: ['shell'],
-      category: 'ops',
-      installed: false,
-      tags: ['shell', '命令', '系统'],
-    },
-    {
-      id: 'file-operations',
-      name: '文件操作',
-      description: '文件读写、目录管理、文件搜索',
-      triggers: ['文件', 'file', '读取', '写入', '目录', '文件夹'],
-      capabilities: ['文件读写', '目录管理', '文件搜索', '批量操作'],
-      toolDeps: ['read', 'write', 'glob'],
-      category: 'ops',
-      installed: false,
+  try {
+    // 动态导入 invoke 以避免循环依赖
+    const { invoke } = await import('@tauri-apps/api/core');
+
+    // 调用后端 skill_list 命令
+    interface BackendSkill {
+    id: string;
+    name: string;
+    description: string;
+    version: string;
+    capabilities: string[];
+    tags: string[];
+  mode: string;
+  enabled: boolean;
+    }
+
+    const backendSkills = await invoke<BackendSkill[]>('skill_list');
+
+    // 转换为前端 Skill 格式
+    const skills: Skill[] = backendSkills.map((s): Skill => ({
+      id: s.id,
+      name: s.name,
+      description: s.description,
+      triggers: s.tags, // 使用 tags 作为触发器
+      capabilities: s.capabilities,
+      toolDeps: [], // 后端暂不提供 toolDeps
+      category: 'discovered', // 后端发现的技能
+      installed: s.enabled,
+      tags: s.tags,
+    }));
+
+    return skills;
+  } catch (err) {
+    console.warn('[skillMarketStore] Failed to load skills from backend, using fallback:', err);
+    // 如果后端调用失败，返回空数组而不是模拟数据
+    return [];
+  }
+}
       tags: ['文件', '目录', '读写'],
     },
     {