feat: update configuration for standalone server and add assembly script

scripts/assemble-standalone.mjs

@@ -0,0 +1,47 @@
+// Assemble a self-contained server into dist/ from the Next standalone output.
+// `next build` with output:"standalone" produces:
+//   .next/standalone/  (server.js + traced node_modules + .next/server)
+//   .next/static/      (NOT inside standalone — must be copied)
+// We copy everything into dist/ so the published package ships one folder that
+// `node dist/server.js` can run.
+import { cp, rm, readdir } from "fs/promises";
+import { existsSync } from "fs";
+
+const STANDALONE = ".next/standalone";
+const STATIC = ".next/static";
+const PUBLIC = "public";
+const OUT = "dist";
+
+if (!existsSync(STANDALONE)) {
+  console.error(
+    `✗ ${STANDALONE} not found. Did "next build" run with output:"standalone"?`
+  );
+  process.exit(1);
+}
+
+await rm(OUT, { recursive: true, force: true });
+await cp(STANDALONE, OUT, { recursive: true });
+await cp(STATIC, `${OUT}/.next/static`, { recursive: true });
+if (existsSync(PUBLIC)) {
+  await cp(PUBLIC, `${OUT}/public`, { recursive: true });
+}
+
+// Next copies the whole project root into the standalone bundle. Prune it down
+// to just the runtime essentials (drops src/, configs, and local notes like
+// CLAUDE.md/AGENTS.md so they never get published).
+const KEEP = new Set([
+  "server.js",
+  ".next",
+  "node_modules",
+  "package.json",
+  "public",
+]);
+for (const entry of await readdir(OUT)) {
+  if (!KEEP.has(entry)) {
+    await rm(`${OUT}/${entry}`, { recursive: true, force: true });
+  }
+}
+
+console.log(
+  `✓ Assembled standalone server into ${OUT}/ (run: node ${OUT}/server.js)`
+);