feat: ship prebuilt plugin bundle for remote dsh install

Remote github installs only get packages/dsh-plugin; without bundle the
host tried pnpm build and hung. Pack web+server into bundle/ and start
from it so other machines can run after dsh plugin add.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/dsh-plugin/scripts/pack-bundle.mjs

@@ -0,0 +1,71 @@
+/**
+ * Pack prebuilt web UI + server into packages/dsh-plugin/bundle
+ * so `dsh plugin add github:…#path:packages/dsh-plugin` works without monorepo.
+ */
+import { execSync } from "node:child_process";
+import {
+  cpSync,
+  existsSync,
+  mkdirSync,
+  rmSync,
+  writeFileSync,
+} from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+import * as esbuild from "esbuild";
+
+const pluginRoot = dirname(dirname(fileURLToPath(import.meta.url)));
+const repoRoot = join(pluginRoot, "../..");
+const bundleRoot = join(pluginRoot, "bundle");
+const webOut = join(bundleRoot, "web");
+const serverOut = join(bundleRoot, "server.mjs");
+
+function run(cmd, cwd = repoRoot) {
+  console.log(`[pack] ${cmd}`);
+  execSync(cmd, { cwd, stdio: "inherit", env: process.env, windowsHide: true });
+}
+
+// 1) Build workspace libs + web
+run("pnpm --filter @mind-map/shared build");
+run("pnpm --filter @mind-map/graph-core build");
+run("pnpm --filter @mind-map/graph-store build");
+run("pnpm --filter @mind-map/layout-engine build");
+// dream-skin ships TS+JSON; esbuild resolves it without a separate tsc emit
+run("pnpm --filter @mind-map/web build");
+
+const webDist = join(repoRoot, "apps/web/dist");
+if (!existsSync(join(webDist, "index.html"))) {
+  throw new Error("apps/web/dist/index.html missing after build");
+}
+
+// 2) Fresh bundle dir
+rmSync(bundleRoot, { recursive: true, force: true });
+mkdirSync(webOut, { recursive: true });
+cpSync(webDist, webOut, { recursive: true });
+
+// 3) Bundle server (workspace + npm deps inlined; node builtins stay external)
+console.log("[pack] esbuild apps/server → bundle/server.mjs");
+await esbuild.build({
+  entryPoints: [join(repoRoot, "apps/server/src/index.ts")],
+  bundle: true,
+  platform: "node",
+  format: "esm",
+  outfile: serverOut,
+  packages: "bundle",
+  banner: {
+    js: "import { createRequire as __mmCr } from 'node:module'; const require = __mmCr(import.meta.url);",
+  },
+  logLevel: "info",
+});
+
+if (!existsSync(serverOut)) {
+  throw new Error("bundle/server.mjs was not produced");
+}
+
+writeFileSync(
+  join(bundleRoot, "README.txt"),
+  "Prebuilt assets for remote dsh plugin install. Regenerated by: node packages/dsh-plugin/scripts/pack-bundle.mjs\n",
+  "utf8",
+);
+
+console.log("[pack] OK →", bundleRoot);