feat: bundle plugin src/ on demand via esbuild

next.config.ts

@@ -42,6 +42,10 @@ const nextConfig: NextConfig = {
   output: "standalone",
   allowedDevOrigins: ["192.168.1.51"],
   basePath: basePath || undefined,
+  // esbuild ships native binaries + a README the bundler can't parse; load
+  // it from node_modules at runtime instead of trying to bundle it. Used by
+  // PLUGIN_DEV_DIR's on-the-fly bundler.
+  serverExternalPackages: ["esbuild"],
   turbopack: {
     root: import.meta.dirname,
   },