Add navi deployment module and integrate SSH inventory for remote management

- Introduced a new `navi` module for managing deployments across multiple hosts.
- Enhanced SSH inventory management to support public key application for authorized hosts.
- Configured system deployment builder for seamless integration with Navi.
- Updated various host configurations to enable deployment capabilities and streamline SSH access.

flake.nix

@@ -103,6 +103,8 @@
       url = "git+https://git.chiasson.cloud/Olivier/DDRM?rev=c3d014f96855e45b53f7391ce19729493887cb96";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+
+    navi.url = "github:cafkafk/navi";
   };
 
   outputs = inputs: