fix: 修复首次 darwin-rebuild 的构建错误

- nix.enable=false 兼容 Determinate Nix (macOS)
- 禁用 catppuccin.nvim (require check 失败)
- fl-clash 用完整 tap 路径放入 casks
- 修复 SSH/git 废弃选项警告
- 更新 flake.lock

home/theme.nix

@@ -4,6 +4,6 @@
   catppuccin = {
     enable = true;
     flavor = "mocha";
-    # Automatically themes: bat, btop, delta, fish, fzf, lazygit, starship, tmux, etc.
+    nvim.enable = false; # catppuccin-nvim require check broken in nixpkgs
   };
 }