v0.11.11: 彻底移除技能系统，工具 44→42，SQLite 7→6 张表

- 删除 src/renderer/services/skill-manager.ts (480行)
- sqlite.ts: 删除 skills 表/索引/迁移/SkillRow接口/CRUD
- ipc.ts: 删除 6 个 skills IPC handler
- preload.ts/types.d.ts: 删除 skills bridge 方法/类型
- agent-engine.ts: 删除技能匹配上下文注入/自动提取
- tool-registry.ts: 删除 skill_list/skill_view 工具定义/执行
- log-service.ts/sub-agent.ts/workspace-panel.ts: 清理引用
- index.html: 帮助面板/工具卡片更新，44→42
- README/release-notes/DEVELOPMENT/AGENT: 文档全量同步

package.json

@@ -1,7 +1,7 @@
 {
   "name": "metona-ollama-desktop",
-  "version": "0.11.10",
-  "description": "Metona Ollama - TypeScript + Electron 桌面 AI 聊天客户端",
+  "version": "0.11.11",
+  "description": "Metona Ollama - TypeScript + Electron \u684c\u9762 AI \u804a\u5929\u5ba2\u6237\u7aef",
   "main": "dist/main/main.js",
   "author": "thzxx",
   "license": "MIT",