refactor: modularize 'ai-tools'

home/modules/ai-tools/opencode.nix

@@ -0,0 +1,40 @@
+{
+  lib,
+  config,
+  pkgs,
+  ...
+}:
+let
+  cfg = config.ai-tools.opencode;
+in
+{
+  options.ai-tools.opencode = {
+    enable = lib.mkEnableOption "opencode";
+  };
+
+  config = lib.mkIf cfg.enable {
+    home.packages = [ pkgs.opencode ];
+
+    home.file.".config/opencode/opencode.json".text = builtins.toJSON {
+      "$schema" = "https://opencode.ai/config.json";
+      permission = {
+        external_directory = {
+          "/run/secrets/" = "deny";
+          "~/.config/sops/age/keys.txt" = "deny";
+          "~/.ssh/id_rsa" = "deny";
+          "~/.ssh/id_ed25519" = "deny";
+          "~/.ssh/id_ecdsa" = "deny";
+          "~/.ssh/id_dsa" = "deny";
+          "/etc/ssh/ssh_host_rsa_key" = "deny";
+          "/etc/ssh/ssh_host_ed25519_key" = "deny";
+          "/etc/ssh/ssh_host_ecdsa_key" = "deny";
+          "/etc/ssh/ssh_host_dsa_key" = "deny";
+        };
+        command = {
+          sops = "deny";
+        };
+      };
+      plugin = [ "@mohak34/opencode-notifier@latest" ];
+    };
+  };
+}