fix(build): preserve exports for library entry

Author: Codex

packages/app/dist/index.js

@@ -38,6 +38,7 @@ export default defineConfig({
     outDir: "dist",
     sourcemap: true,
     rollupOptions: {
+      preserveEntrySignatures: "exports-only",
       input: {
         index: path.resolve(__dirname, "src/index.ts"),
         main: path.resolve(__dirname, "src/app/main.ts")