refactor: move ark into dentritic pattern

modules/koon/host/ark/service/wakapi.nix

@@ -0,0 +1,50 @@
+{ ... }: {
+  flake.nixosModules.koonArkServiceWakapi = { config, ... }: {
+    nixpkgs.overlays = [
+      (final: prev: let
+          version = "2.15.0";
+        in {
+
+        wakapi = (prev.buildGoModule.override { go = prev.go_1_25; }) {
+          pname = "wakapi";
+          version = version;
+
+          src = final.fetchFromGitHub {
+            owner = "k2on";
+            repo = "wakapi";
+            rev = "koon-fork";
+            hash = "sha256-FYGtoJmbqUD02/JKvON1RqpjkrDkAOkfPwMAUZ2MSE4=";
+          };
+
+          vendorHash = "sha256-912x6LwitYXdjWpP75Xoc56JXadeLQZuESSyLoaJcU0=";
+
+          excludedPackages = [ "scripts" ];
+
+          postPatch = ''echo ${version} > version.txt'';
+
+          ldflags = [ "-s" "-w" ];
+
+          passthru = {
+            nixos = prev.nixosTests.wakapi;
+            updateScript = prev.nix-update-script { };
+          };
+
+          meta = prev.wakapi.meta // {
+            version = version;
+            mainProgram = "wakapi";
+          };
+        };
+
+      })
+    ];
+
+    services.wakapi = {
+      enable = true;
+      # passwordSaltFile = config.sops.secrets."waka-password-salt".path;
+      settings = {
+        server.port = 3006;
+        app.avatar_url_template = "https://auth.koon.us/api/users/fbffa48a-faf7-4230-a89f-0da184f5948c/profile-picture.png";
+      };
+    };
+  };
+}