The protocol link is a different kind of module from the service
pseudo-clients, so give it its own home: modules/inspircd ->
modules/protocol/inspircd. A future ircd link is a new crate alongside
it. Workspace member, dependency path, the crate's own api path, and the
docs are updated to match. No code change.
The service pseudo-clients and the ircd protocol link sat flat at the
repo root, mixed in with the daemon core and the SDK. Move them all
under modules/ so the tree separates concerns cleanly: the daemon in
src/, the SDK every module links against in api/, and the loadable
modules — the pseudo-clients plus the protocol link — in modules/.
Workspace members, the daemon's per-crate dependency paths, and each
module's api path are updated to match; the docs follow. No code change.
