Update Healer Man server

vite.config.ts

@@ -4,6 +4,8 @@ import { defineConfig } from "vitest/config";
 import react from "@vitejs/plugin-react";
 // @ts-expect-error Shared Node HTTP middleware also serves production bundles.
 import { createBundledContentHandler } from "./server/bundled-content.mjs";
+// @ts-expect-error Local-only Node middleware is activated only in balance-lab-gui mode.
+import { createLocalBalanceLabApi } from "./server/local-balance-lab-api.mjs";
 
 const packageVersion = (JSON.parse(readFileSync(new URL("./package.json", import.meta.url), "utf8")) as { version: string }).version;
 
@@ -11,9 +13,22 @@ export default defineConfig(({ mode }) => {
   const androidBuild = mode === "android";
   const shelvedModesEnabled = mode === "shelved";
   const balanceLabRuntime = mode === "balance-lab";
+  const localBalanceLabGui = mode === "balance-lab-gui";
   const downloadableBuild = androidBuild || mode === "production" || shelvedModesEnabled;
   return {
     plugins: [react(), {
+      name: "local-balance-lab-api",
+      configureServer(server) {
+        if (!localBalanceLabGui) return;
+        const api = createLocalBalanceLabApi();
+        server.httpServer?.once("close", () => api.close());
+        server.middlewares.use((request, response, next) => {
+          void api.handle(request, response).then((handled: boolean) => {
+            if (!handled) next();
+          }).catch(next);
+        });
+      },
+    }, {
       name: "bundled-content-preview",
       configurePreviewServer(server) {
         const serve = createBundledContentHandler(path.resolve(androidBuild ? "dist-android" : "dist"));
@@ -46,6 +61,7 @@ export default defineConfig(({ mode }) => {
       "import.meta.env.VITE_APP_VERSION": JSON.stringify(packageVersion),
       "import.meta.env.VITE_CONTENT_MODE": JSON.stringify(downloadableBuild ? "downloadable" : "bundled"),
       "import.meta.env.VITE_SHELVED_MODES_ENABLED": JSON.stringify(shelvedModesEnabled ? "true" : "false"),
+      "import.meta.env.VITE_LOCAL_BALANCE_LAB_GUI": JSON.stringify(localBalanceLabGui ? "true" : "false"),
     },
     resolve: {
       alias: {
@@ -90,6 +106,7 @@ export default defineConfig(({ mode }) => {
         : [
           "**/dungeon-pipeline/**",
           "**/playtest-artifacts/**",
+          ...(localBalanceLabGui ? ["**/artifacts/balance-lab-gui-runtime/**"] : []),
         ],
     },
     },