feat: 新增 account 和 plan 目录

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

account/admin/skills/system/list-directory/SKILL.md

@@ -0,0 +1,41 @@
+---
+name: list-directory
+description: List directory contents including files and subdirectories. When you need to explore directory structure, find specific files, or check what exists in a folder.
+system: true
+handler: filesystem
+tool-name: list_directory
+category: File System
+---
+
+# List Directory
+
+列出目录内容。
+
+## Parameters
+
+| 参数 | 类型 | 必填 | 说明 |
+|-----|------|-----|------|
+| path | string | 是 | 目录路径 |
+
+## Returns
+
+- 文件名和类型
+- 文件大小
+- 修改时间
+
+## Examples
+
+**列出当前目录**:
+```json
+{"path": "."}
+```
+
+**列出指定目录**:
+```json
+{"path": "/home/user/documents"}
+```
+
+## Related Skills
+
+- `read-file`: 读取文件内容
+- `write-file`: 写入文件