feat(nix): add comfy-ui module and enable it for server

nix/manifest.nix

@@ -23,6 +23,7 @@
             }
           ];
         };
+        extraCfg.server.web-apps.comfy-ui.enable = true;
       };
       apollo = {
         graphical = false;

nix/modules/server/web-apps/comfy-ui.nix

@@ -0,0 +1,34 @@
+{
+  lib,
+  config,
+  inputs,
+  ...
+}:
+let
+  inherit (lib.lists) singleton;
+  inherit (config.flake.lib.services) mkWebApp;
+in
+{
+  flake.modules.nixos.default =
+    { config, ... }:
+    let
+      upstreamCfg = config.services.comfyUi;
+    in
+    mkWebApp {
+      inherit config;
+      name = "comfy-ui";
+      defaultPort = 8188;
+      persistDirs = singleton {
+        directory = upstreamCfg.dataDir;
+        inherit (upstreamCfg) user group;
+        mode = "777";
+      };
+      extraConfig.services.comfyUi = {
+        enable = true;
+        listenHost = "0.0.0.0";
+      };
+    }
+    // {
+      imports = [ inputs.stable-diffusion-webui-nix.nixosModules.default ];
+    };
+}