feat: add post-install cmail Bridge setup

Bridge first-run is interactive, so I put the cmail wiring in a post-install
helper rather than running it inside archsetup. scripts/cmail-setup-finish.sh
handles the post-first-run steps idempotently: it decrypts the encrypted
cmailpass, copies Bridge's self-signed cert to ~/.config/protonbridge.pem,
symlinks the cmail-action triage helper into ~/.local/bin, and enables the
user-level protonmail-bridge service.

I added loginctl enable-linger in essential_services so the user service
survives logout — without it, triaging cmail from a remote agent or SSH
session has nothing to talk to. outro prints a four-step runbook for the
manual steps after reboot.

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