Added nixos configs

OLD CONFIGS/nix_new/modules/home-manager/dev/ssh-client.nix

@@ -0,0 +1,31 @@
+{ config, lib, pkgs, ... }:
+
+let
+  confDir = "${config.home.homeDirectory}/nixos/files/conf/ssh";
+  sshClientConf = "${confDir}/ssh-client.conf";
+in
+{
+  programs.ssh = {
+    enable = true;
+    enableDefaultConfig = false;
+
+    matchBlocks."*" = {
+    addKeysToAgent = "yes";
+    serverAliveInterval = 30;
+    serverAliveCountMax = 3;
+    };
+
+    # Load your extra SSH config from a file in ~/nixos/files/conf/ssh/
+    extraConfig = ''
+    Include ${config.home.homeDirectory}/nixos/files/conf/ssh/ssh-client.conf
+  '';
+  };
+
+  # Home Manager's ssh-agent (NOT programs.ssh.startAgent; that's NixOS)
+  services.ssh-agent = {
+    enable = true;
+
+    # Optional: if you use zsh, this helps export SSH_AUTH_SOCK in your shell
+    enableZshIntegration = true;
+  };
+}