refactor: use bun to execute server and analytics

server/scripts/dev.ts

@@ -0,0 +1,27 @@
+// Dev server with auto-restart. `bun --watch` only tracks imported modules,
+// but quests are read from YAML at startup, so rewrite the entry file (same
+// contents) whenever a quest file changes to trigger a restart. Bun ignores
+// timestamp-only changes, so `touch` would not work.
+import { watch, readFileSync, writeFileSync } from 'node:fs'
+import path from 'node:path'
+
+const entry = path.join(import.meta.dir, '../src/index.ts')
+const questsDir = path.join(import.meta.dir, '../../quests')
+
+const server = Bun.spawn(['bun', '--watch', entry], {
+  stdio: ['inherit', 'inherit', 'inherit'],
+})
+
+let timer: ReturnType<typeof setTimeout> | undefined
+watch(questsDir, { recursive: true }, (_event, filename) => {
+  if (!filename?.endsWith('.yml')) return
+  clearTimeout(timer)
+  timer = setTimeout(() => {
+    writeFileSync(entry, readFileSync(entry))
+  }, 100)
+})
+
+const stop = () => server.kill()
+process.on('SIGINT', stop)
+process.on('SIGTERM', stop)
+process.exit(await server.exited)