refactor: flatten monorepo into standalone project

compile.ts

@@ -0,0 +1,64 @@
+import { mkdir, rm } from 'node:fs/promises'
+import { parseArgs } from 'node:util'
+
+const ENTRYPOINT = '.output/server/index.mjs'
+const OUTDIR = 'out'
+
+const SUPPORTED_TARGETS: readonly Bun.Build.CompileTarget[] = [
+  'bun-windows-x64',
+  'bun-darwin-arm64',
+  'bun-darwin-x64',
+  'bun-linux-x64',
+  'bun-linux-arm64',
+]
+
+const isSupportedTarget = (value: string): value is Bun.Build.CompileTarget =>
+  (SUPPORTED_TARGETS as readonly string[]).includes(value)
+
+const { values } = parseArgs({
+  options: { target: { type: 'string' } },
+  strict: true,
+  allowPositionals: false,
+})
+
+const resolveTarget = (): Bun.Build.CompileTarget => {
+  if (values.target !== undefined) {
+    if (!isSupportedTarget(values.target)) {
+      throw new Error(`Invalid target: ${values.target}\nAllowed: ${SUPPORTED_TARGETS.join(', ')}`)
+    }
+    return values.target
+  }
+
+  const os = process.platform === 'win32' ? 'windows' : process.platform
+  const candidate = `bun-${os}-${process.arch}`
+  if (!isSupportedTarget(candidate)) {
+    throw new Error(`Unsupported host: ${process.platform}-${process.arch}`)
+  }
+  return candidate
+}
+
+const main = async () => {
+  const target = resolveTarget()
+  const suffix = target.replace('bun-', '')
+  const outfile = `server-${suffix}`
+
+  await mkdir(OUTDIR, { recursive: true })
+  await Promise.all([rm(`${OUTDIR}/${outfile}`, { force: true }), rm(`${OUTDIR}/${outfile}.exe`, { force: true })])
+
+  const result = await Bun.build({
+    entrypoints: [ENTRYPOINT],
+    outdir: OUTDIR,
+    compile: { outfile, target },
+  })
+
+  if (!result.success) {
+    throw new Error(result.logs.map(String).join('\n'))
+  }
+
+  console.log(`✓ ${target} → ${OUTDIR}/${outfile}`)
+}
+
+main().catch((err) => {
+  console.error('❌', err instanceof Error ? err.message : err)
+  process.exit(1)
+})