build: add solution and client bundling scripts

scripts/build.mjs

@@ -0,0 +1,20 @@
+import { spawnSync } from 'node:child_process'
+import { dirname, resolve } from 'node:path'
+import { fileURLToPath } from 'node:url'
+
+const root = resolve(dirname(fileURLToPath(import.meta.url)), '..')
+
+function run(command) {
+  console.log(`\n> ${command}`)
+  const result = spawnSync(command, { cwd: root, stdio: 'inherit', shell: true })
+  if (result.status !== 0) {
+    console.error(`\n[build] Command failed: ${command}`)
+    process.exit(result.status ?? 1)
+  }
+}
+
+run('npm --prefix client run build')
+run('node scripts/copy-client.mjs')
+run('dotnet build HubMi.slnx --configuration Release')
+
+console.log('\n[build] Done.')