new file: flake.lock

modified:   home/git.nix
	modified:   hosts/README.md
	modified:   hosts/virtualbox/README.md
	modified:   hosts/virtualbox/configuration.nix
	modified:   modules/core/users.nix
	modified:   modules/desktop/pkg.nix
	modified:   modules/server/README.md
	modified:   profiles/README.md

hosts/virtualbox/README.md

@@ -1,11 +1,12 @@
-# hosts/virtualbox
+# 📦 hosts/virtualbox
 
-VirtualBox guest host entry.
+VirtualBox 虚拟机主机入口。
 
-## Layout
+## 🌲 目录树
 ```text
-hosts/virtualbox
-|- default.nix         # host entry, imports configuration.nix
-|- configuration.nix   # profile + hostName + machine specific options
-`- README.md
-```
+📦 hosts/virtualbox
+├─ 🧩 default.nix                # 主机入口，引用 configuration.nix 与硬件配置
+├─ ⚙️ configuration.nix          # profile + hostName + 机器相关配置
+├─ 🧱 hardware-configuration.nix # 由 nixos-generate-config 生成的硬件配置
+└─ 📝 README.md
+```

hosts/virtualbox/configuration.nix

@@ -6,6 +6,9 @@
 
   networking.hostName = "virtualbox";
 
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
   # Machine-specific config generated by nixos-generate-config can be
   # merged here: disk layout, boot loader, filesystem, hardware options.
-}
+}