fix: 修复 nix flake check 和 build 错误

- 添加 system.primaryUser (nix-darwin 新要求)
- 全局应用 overlays 解决 comment-checker 找不到的问题
- git/ssh/delta 选项迁移到 home-manager 新 API
- 包改名: dockerfile-language-server, nixfmt, nixd
- neovim withRuby=false, catppuccin homeModules 更名
- 更新 flake.lock (nixpkgs, home-manager, catppuccin)

home/dev/git.nix

@@ -3,19 +3,11 @@
 {
   programs.git = {
     enable = true;
-    userName = "imbytecat";
-    userEmail = "imbytecat@gmail.com";
-
-    delta = {
-      enable = true;
-      options = {
-        navigate = true;
-        side-by-side = true;
-        line-numbers = true;
+    settings = {
+      user = {
+        name = "imbytecat";
+        email = "imbytecat@gmail.com";
       };
-    };
-
-    extraConfig = {
       merge.conflictstyle = "zdiff3";
       pull.rebase = true;
       push.autoSetupRemote = true;
@@ -26,6 +18,16 @@
     };
   };
 
+  programs.delta = {
+    enable = true;
+    enableGitIntegration = true;
+    options = {
+      navigate = true;
+      side-by-side = true;
+      line-numbers = true;
+    };
+  };
+
   programs.lazygit = {
     enable = true;
     settings = {
@@ -46,7 +48,9 @@
 
   programs.ssh = {
     enable = true;
-    addKeysToAgent = "yes";
-    matchBlocks."*".identityFile = "~/.ssh/id_ed25519";
+    matchBlocks."*" = {
+      identityFile = "~/.ssh/id_ed25519";
+      addKeysToAgent = "yes";
+    };
   };
 }