简化stable/unstable切换的方式；增加兼容性代码，根据版本引用

profiles/gaea/configuration.nix

@@ -1,4 +1,4 @@
-args@{ self, pkgs, home-manager, username, sysversion, ... }: {
+args@{ self, pkgs, home-manager, username, version, ... }: {
   # You can import other NixOS modules here
   imports = [
     # If you want to use modules your own flake exports (from modules/nixos):
@@ -34,7 +34,7 @@ args@{ self, pkgs, home-manager, username, sysversion, ... }: {
       # home-manager.useUserPackages = true;
       home-manager = {
         extraSpecialArgs = {
-          inherit (args) self inputs outputs libs hostname username useremail sysversion;
+          inherit (args) self inputs outputs libs sourcepath hostname username useremail version;
         };
         users."${username}" = { ... }: {
           imports = [
@@ -48,5 +48,5 @@ args@{ self, pkgs, home-manager, username, sysversion, ... }: {
   ];
 
   # https://nixos.wiki/wiki/FAQ/When_do_I_update_stateVersion
-  system.stateVersion = sysversion;
+  system.stateVersion = version;
 }