feat: add Feishu cloud disk share parser (file + folder support)

Add FsTool parser for Feishu (飞书) cloud disk share links.
Supports both file and folder share URL formats:
- File: https://xxx.feishu.cn/file/{token}
- Folder: https://xxx.feishu.cn/drive/folder/{token}

The parser:
- Fetches anonymous session cookies from share page
- Uses Range probe to detect filename and size
- Returns download URL with required headers (Cookie, Referer)
- Supports folder listing via v3 API with pagination
- Updates README with Feishu in supported cloud disk list

Agent-Logs-Url: https://github.com/qaiu/netdisk-fast-download/sessions/56418d09-a396-40cf-a080-c71e4a69c323

Co-authored-by: qaiu <29825328+qaiu@users.noreply.github.com>

README.md

@@ -94,6 +94,7 @@ https://nfd-parser.github.io/nfd-preview/preview.html?src=https%3A%2F%2Flz.qaiu.
 - Onedrive-pod
 - Dropbox-pdp
 - iCloud-pic
+- [飞书云盘-fs](https://www.feishu.cn/)
 ### 专属版提供
 - [夸克云盘-qk](https://pan.quark.cn/)
 - [UC云盘-uc](https://fast.uc.cn/)
@@ -340,6 +341,7 @@ json返回数据格式示例:
 | WPS云文档      | √       | X        | 5G(免费)   | 10M(免费)/2G(会员)  |
 | 夸克网盘        | x       | √        | 10G       | 不限大小            | 
 | UC网盘        | x       | √        | 10G       | 不限大小            | 
+| 飞书云盘        | √       | X        | 15G       | 不限大小            |
 
 # 打包部署