fix: serve design studio through the component app production route

scripts/start.ts

@@ -1,18 +1,4 @@
-import { startStudio } from "./studio.ts";
-
-const studio = await startStudio();
-const site = Bun.spawn([process.execPath, "dist/server.js"], {
-  stdout: "inherit",
-  stderr: "inherit",
-  stdin: "inherit",
-  env: process.env,
-});
-const stop = () => {
-  studio.stop(true);
-  site.kill("SIGTERM");
-};
-process.on("SIGINT", stop);
-process.on("SIGTERM", stop);
-const code = await site.exited;
-studio.stop(true);
-process.exit(code);
+// Compatibility entry point: Studio is mounted in the app middleware now.
+const entry = "../dist/server.js";
+await import(entry);
+export {};