Add the remote_clipboard tool to the MCP remote control surface, writing
text to the remote host's clipboard via COMMAND_SCREEN_SET_CLIPBOARD
through the established screen sub-connection. Input UTF-8 is converted
to GBK (ToAnsi, code page 936) to match the client's CF_TEXT/ANSI
clipboard path, mirroring the existing CScreenSpyDlg::SendServerClipboard
packet format. Pasting remains a separate step (remote_keyboard Ctrl+V).
Known MVP limitation, documented in the tool description: non-GBK
characters (e.g. emoji) are replaced by '?' on the CF_TEXT path.
Co-Authored-By: deepseek-v4-pro