dsh-remote-dirpicker: Make directory selection consistent for DSH Web's remote "Add Workspace"

dsh-remote-dirpicker is an MIT-licensed DSH plugin designed to address the issue where the "Add Workspace" directory selection feature fails to function properly when accessing DSH Web via nginx reverse proxy, public network, or LAN IP. By adjusting plugin configuration through a combination layer patch, this plugin avoids modifying the DSH core code. Its core mechanism involves disabling the automatic picker `directory-picker-auto` and forcing the mount of the `browse` host capability, ensuring that both remote and local access utilize a unified in-browser directory browser interface. The plugin supports browsing the host file system within the browser, including features such as breadcrumb navigation, absolute path navigation, path editing, hidden file display, and creating new folders, while exposing these capabilities via DSH's own RPC channel.