整理 NixOS 配置：面向 i7-12700F + RTX 4060 的模块化桌面配置

从当前 /etc/nixos 拆出 common/plasma/中文/应用/打印模块，新增 NVIDIA 独显支持，并去掉原机硬件 UUID。

hosts/desktop/default.nix

@@ -0,0 +1,21 @@
+{ config, pkgs, ... }:
+
+{
+  imports = [
+    ./hardware.nix
+    ../../modules/common.nix
+    ../../modules/desktop-plasma.nix
+    ../../modules/chinese.nix
+    ../../modules/nvidia.nix
+    ../../modules/gaming.nix
+    ../../modules/printing.nix
+    ../../modules/apps.nix
+  ];
+
+  networking.hostName = "desktop";
+
+  # 12700F 桌面机：性能调度即可
+  powerManagement.cpuFreqGovernor = "performance";
+
+  system.stateVersion = "26.05";
+}

hosts/desktop/hardware.nix

@@ -0,0 +1,53 @@
+# 目标机（i7-12700F + RTX 4060）上必须重新生成本文件，当前为占位骨架。
+#
+# 安装时在目标机执行：
+#   sudo nixos-generate-config --root /mnt   # 若在 live 安装环境
+#   # 或已装系统上：
+#   sudo nixos-generate-config
+# 然后把生成的 hardware-configuration.nix 内容覆盖本文件（保留下面 nvidia 相关不要被冲掉的话，
+# 显卡驱动在 modules/nvidia.nix，本文件只放磁盘/CPU/固件）。
+#
+# 切勿带着本仓库里旧机器（Ultra 9 / 另一块盘 UUID）的分区信息开机。
+
+{ config, lib, pkgs, modulesPath, ... }:
+
+{
+  imports = [ (modulesPath + "/installer/scan/not-detected.nix") ];
+
+  boot.initrd.availableKernelModules = [
+    "xhci_pci"
+    "ahci"
+    "nvme"
+    "usbhid"
+    "uas"
+    "sd_mod"
+  ];
+  boot.initrd.kernelModules = [ ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+
+  # === 必须按目标机实际分区改 UUID / 挂载点 ===
+  # fileSystems."/" = { device = "/dev/disk/by-uuid/REPLACE-ROOT"; fsType = "ext4"; };
+  # fileSystems."/boot" = { device = "/dev/disk/by-uuid/REPLACE-ESP"; fsType = "vfat"; options = [ "fmask=0077" "dmask=0077" ]; };
+  # swapDevices = [ { device = "/dev/disk/by-uuid/REPLACE-SWAP"; } ];
+
+  fileSystems."/" = lib.mkDefault {
+    device = "/dev/disk/by-uuid/REPLACE-ME-ROOT-UUID";
+    fsType = "ext4";
+  };
+
+  fileSystems."/boot" = lib.mkDefault {
+    device = "/dev/disk/by-uuid/REPLACE-ME-BOOT-UUID";
+    fsType = "vfat";
+    options = [
+      "fmask=0077"
+      "dmask=0077"
+    ];
+  };
+
+  swapDevices = lib.mkDefault [ ];
+
+  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
+  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
+  hardware.enableRedistributableFirmware = true;
+}