Initial commit: plugin repository structure

- GitHub Actions workflows for signing and validation
- Example file-manager plugin
- Scripts for batch signing

plugins/file-manager/manifest.json

@@ -0,0 +1,8 @@
+{
+  "name": "file-manager",
+  "version": "1.0.0",
+  "description": "文件管理器插件，提供远程文件浏览和管理功能",
+  "author": "GoTunnel Official",
+  "run_at": "client",
+  "type": "app"
+}