feat(nvim): wire OSC 52 clipboard provider on SSH sessions

Previously `clipboard` was set to empty inside SSH sessions on the
assumption no clipboard tool would be reachable. That broke yank →
host-clipboard on the remote-dev VM.

nvim ≥0.10 ships a built-in OSC 52 provider
(vim.ui.clipboard.osc52). The terminal emulator (ghostty locally,
zellij forwarding inside it) handles the escape sequence and writes
to the host's clipboard, so we get yank-to-host without needing
wl-copy/xclip on the VM. Paste over OSC 52 is rarely supported by
terminals (security), so we wire it but it's effectively a no-op;
bracketed paste from the terminal still delivers clipboard contents
into the buffer.

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