feat: fix build scripts and server

server/vite.config.ts

@@ -0,0 +1,33 @@
+import { defineConfig } from 'vite';
+
+const prefix = process.env.__INTERNAL_PREFIX || '/admin';
+if (prefix.endsWith('/')) {
+	throw new Error('Prefix must not end with a slash');
+}
+
+export default defineConfig(() => {
+	return {
+		build: {
+			minify: false,
+			target: 'esnext',
+			rollupOptions: {
+				input: './server/prod.mjs',
+				output: {
+					entryFileNames: 'server.js',
+					dir: 'build/headplane',
+					banner: '#!/usr/bin/env node\n',
+				},
+				external: (id) => id.startsWith('node:') || id === 'ws',
+			},
+		},
+		define: {
+			PREFIX: JSON.stringify(prefix),
+		},
+		resolve: {
+			alias: {
+				stream: 'node:stream',
+				crypto: 'node:crypto',
+			},
+		},
+	};
+});