feat: 添加服务层增强与零散改进

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/cli/exit.ts

@@ -17,7 +17,6 @@
 
 /** Write an error message to stderr (if given) and exit with code 1. */
 export function cliError(msg?: string): never {
-  // biome-ignore lint/suspicious/noConsole: centralized CLI error output
   if (msg) console.error(msg)
   process.exit(1)
   return undefined as never