feat: add uConsole CM5 host configuration with Reticulum mesh stack

- New NixOS host 'uConsole' for ClockworkPi CM5 portable terminal
- flake.nix: add nixos-uconsole and nixos-raspberrypi inputs
- Imports: nixos-uconsole.nixosModules.uconsole-cm5,
  nixos-raspberrypi.nixosModules.raspberry-pi-5.base
- Full package list: base tools, HAM radio, SDR/RF, mesh/LoRa,
  security tools, GPS/maps
- Reticulum stack (rns 1.2.9, lxmf 0.9.8, nomadnet 1.1.1) built
  from PyPI via overlays/reticulum.nix
- systemd services: rnsd (Reticulum daemon), kismet (Wi-Fi IDS)
- Kernel modules for SDR (rtl-sdr, dvb) and USB WiFi
- Follows existing host config conventions (cyt-pi as template)

hosts/uConsole/hardware-configuration.nix

@@ -0,0 +1,26 @@
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports =
+    [ (modulesPath + "/installer/scan/not-detected.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "usbhid" "usb_storage" "sdhci_pci" "nvme" ];
+  boot.initrd.kernelModules = [ ];
+  boot.extraModulePackages = [ ];
+
+  # uConsole CM5 uses NVMe or eMMC for boot storage
+  # The uconsole-cm5 module sets up /boot/firmware and default /
+  # Override device label here if using different storage
+  fileSystems."/" = lib.mkDefault {
+    device = "/dev/disk/by-label/NIXOS_UCM5";
+    fsType = "ext4";
+    options = [ "noatime" ];
+  };
+
+  swapDevices = [ ];
+
+  nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";
+  hardware.enableRedistributableFirmware = true;
+  powerManagement.cpuFreqGovernor = lib.mkDefault "ondemand";
+}