Relocate SSH inventory and rbw socket wiring from `modules/lib/` to
dedicated `modules/ssh/` modules to improve logical grouping.
- Move `ssh-inventory.nix` to `modules/ssh/inventory.nix`.
- Move `rbw-ssh-socket.nix` to `modules/ssh/rbw.nix`.
- Relocate `users-merge.nix` logic into `modules/system/users.nix` to
reduce dependency on generic library modules.
- Update `docs/conventions.md` to reflect new module paths.
- Refactor `modules/deploy/navi.nix` to use a local helper for
generating Navi hive configurations.
- Add Pi5 specific Niri KDL configuration snippets.
Introduce rbw settings within olivier's home-manager module to
centralize the email and base_url configuration. This replaces
manual per-host configuration with a declarative approach.
Refactor the SSH configuration generation to reduce duplication and
improve efficiency.
- Extract `IdentityFile` line generation into a shared variable in
`ssh-inventory.nix` to ensure consistency between per-host and
gitea blocks.
- Optimize `selectedHosts` resolution in `home-manager/default.nix`
by reusing `activeHosts` when the "all" wildcard is used.
- Tighten IPv4 regex matching in `ssh-inventory.nix` using anchors.
- Update `users-merge.nix` to propagate `extraIdentities` to the
rbw outbound configuration.
- Set default `authorizedHosts` to "all" for inbound SSH users.
Olivier