feat: add auth gate and Chinese command parsing

Co-authored-by: Cursor <cursoragent@cursor.com>

src/auth.ts

@@ -0,0 +1,9 @@
+export function isAuthorized(opts: {
+  allowAllUsers: boolean
+  allowedUserIds: number[]
+  userId?: number
+}): boolean {
+  if (opts.allowAllUsers) return true
+  if (opts.userId === undefined) return false
+  return opts.allowedUserIds.includes(opts.userId)
+}