chore: release v0.4.27

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

src/app/api/version/shutdown/route.js

@@ -0,0 +1,15 @@
+import { NextResponse } from "next/server";
+import { killAppProcesses } from "@/lib/appUpdater";
+
+// Shutdown app to release file locks for manual update
+export async function POST() {
+  try {
+    await killAppProcesses();
+  } catch { /* best effort */ }
+
+  const response = NextResponse.json({ success: true, message: "Shutting down for manual update..." });
+
+  setTimeout(() => process.exit(0), 500);
+
+  return response;
+}