fix(web-app): Sync backup skills catalog

tools/scripts/tests/setup_web_sync.test.js

@@ -0,0 +1,36 @@
+const assert = require("assert");
+const fs = require("fs");
+const os = require("os");
+const path = require("path");
+
+async function main() {
+  const { copyIndexFiles } = await import("../../scripts/setup_web.js");
+
+  const root = fs.mkdtempSync(path.join(os.tmpdir(), "setup-web-sync-"));
+  try {
+    const source = path.join(root, "skills_index.json");
+    const dest = path.join(root, "public", "skills.json");
+    const backup = path.join(root, "public", "skills.json.backup");
+
+    fs.mkdirSync(path.dirname(dest), { recursive: true });
+    fs.writeFileSync(source, JSON.stringify([{ id: "demo", category: "testing" }], null, 2));
+
+    copyIndexFiles(source, dest, backup);
+
+    assert.deepStrictEqual(
+      JSON.parse(fs.readFileSync(dest, "utf8")),
+      JSON.parse(fs.readFileSync(source, "utf8")),
+    );
+    assert.deepStrictEqual(
+      JSON.parse(fs.readFileSync(backup, "utf8")),
+      JSON.parse(fs.readFileSync(source, "utf8")),
+    );
+  } finally {
+    fs.rmSync(root, { recursive: true, force: true });
+  }
+}
+
+main().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});