Move realwallpaper service and lassul.us website from prism to neoprism.
DNS for lassul.us already points at neoprism.

bgt-bot is commented out on neoprism for now; can be enabled later if it
goes down on prism (which currently isn't deploying anyway).

Drop the now-redundant lassul.us -> orange.r proxy in orange-host.nix and
the lassul.us acme fallback on prism.

Wraps noctalia-shell so declarative bits are merged into the user's
~/.config/noctalia/settings.json on every start. The file stays
writable; only fields covered by 'settings' (deep-merge) and
'settingsPatches' (jq filters) are pinned, so user GUI tweaks to
other keys survive.

Also moves the sway workspace patch (named/global workspaces,
click-to-current-output) into the wrapper behind 'swayWorkspaceFix',
and ships a default config that pins the dark-mode hook and shows
workspace names in the bar.