feat: 统一 apps/mcp/services 为 entries/ Skill 格式

将 20 个条目从三个分散目录（apps/8、mcp/7、services/5）迁移到统一的
entries/ 目录。每个条目包含：
- manifest.json：极简结构化元数据
- install.md：自然语言安装说明（如适用）
- usage.md：自然语言使用说明和连接配置

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

entries/playwright-mcp/install.md

@@ -0,0 +1,16 @@
+# 安装 Playwright MCP
+
+## 环境要求
+- Node.js >= 18
+
+## 安装步骤
+1. 运行安装命令：
+```bash
+npx playwright install chromium
+```
+
+## 验证
+运行以下命令确认可正常启动：
+```bash
+npx @playwright/mcp@latest --help
+```

entries/playwright-mcp/manifest.json

@@ -0,0 +1,19 @@
+{
+  "id": "playwright-mcp",
+  "name": "Playwright MCP",
+  "type": "mcp",
+  "version": "0.0.68",
+  "author": "Microsoft",
+  "description": "浏览器自动化 — 网页导航、截图、表单填写、DOM 操作、PDF 生成",
+  "tags": [
+    "浏览器",
+    "自动化",
+    "Playwright"
+  ],
+  "icon": "terminal",
+  "platformSupport": [
+    "macos",
+    "windows",
+    "linux"
+  ]
+}

entries/playwright-mcp/usage.md

@@ -0,0 +1,29 @@
+# 使用 Playwright MCP
+
+## 服务描述
+浏览器自动化 — 网页导航、截图、表单填写、DOM 操作、PDF 生成
+
+## 连接方式
+- **传输协议**：stdio
+- **启动命令**：`npx @playwright/mcp@latest`
+
+### 连接配置
+```json
+{
+  "transport": "stdio",
+  "command": "npx",
+  "args": [
+    "@playwright/mcp@latest"
+  ]
+}
+```
+
+## 可用能力
+- `page_navigate`
+- `screenshot`
+- `dom_query`
+- `form_fill`
+- `pdf_generate`
+- `content_extract`
+
+共提供 **33** 个工具。