refactor(canvas): host A2UI via gateway

scripts/canvas-a2ui-copy.ts

@@ -0,0 +1,19 @@
+import fs from "node:fs/promises";
+import path from "node:path";
+import { fileURLToPath } from "node:url";
+
+const repoRoot = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "..");
+const srcDir = path.join(repoRoot, "src", "canvas-host", "a2ui");
+const outDir = path.join(repoRoot, "dist", "canvas-host", "a2ui");
+
+async function main() {
+  await fs.stat(path.join(srcDir, "index.html"));
+  await fs.stat(path.join(srcDir, "a2ui.bundle.js"));
+  await fs.mkdir(path.dirname(outDir), { recursive: true });
+  await fs.cp(srcDir, outDir, { recursive: true });
+}
+
+main().catch((err) => {
+  console.error(String(err));
+  process.exit(1);
+});