dsh-remote-picker: Fix a directory picker that enforces in-browser browsing

When DeepSeek Harness (DSH) is accessed remotely through reverse-proxy setups such as Tailscale or cloudflared, its default directory-picker component invokes native operating system dialogs due to its loopback-binding mechanism, making it inoperable from a remote browser. The dsh-remote-picker plugin fixes the remote directory-selection failure by using a bundle-patch mechanism to force the in-browser browsing mode. It requires no changes to the DSH core code: after installation, simply restarting the service is sufficient to enable it, ensuring reliable use on unattended hosts.