feat: add Hyperspace Pods NixOS module

Create modules/nixos/services/hyperspace.nix for Hyperspace Pods P2P AI cluster agent. Registered in flake.nix under lazyworkhorse modules list.

- Fetches CLI binary v5.45.30 via fetchurl with SRI hash verification
- Systemd system service: auto profile, api port 8080, ai-worker user
- GPU device access via DeviceAllow (kfd+dri) and video+render groups
- Service hardening: NoNewPrivileges, ProtectHome, ProtectSystem, PrivateTmp
- Firewall: TCP 4001 (libp2p), 30301 (chain), 8080 (API); UDP 4001 (libp2p)
- AMD MI50 ROCm compatibility via HSA_OVERRIDE_GFX_VERSION=9.0.6

flake.nix

@@ -61,6 +61,7 @@
               ./modules/nixos/services/open_code_server.nix
               ./modules/nixos/services/ollama_init_custom_models.nix
               ./modules/nixos/services/openclaw_node.nix
+              ./modules/nixos/services/hyperspace.nix
               ./modules/nixos/security/ai-worker-restricted.nix
               ./users/gortium.nix
               ./users/ai-worker.nix