style(frontend): attachToken 超时异常文案由 fingerprint 泛化（评审 nit）

- withTimeout 现被指纹与令牌两条路径共用，错误文案不再特指指纹

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

Author: yyyCode

vue/src/api/http.js

@@ -34,7 +34,7 @@ async function attachToken(headers) {
 
 function withTimeout(promise, ms) {
   return new Promise((resolve, reject) => {
-    const timer = setTimeout(() => reject(new Error('fingerprint timeout')), ms)
+    const timer = setTimeout(() => reject(new Error('header attach timeout')), ms)
     promise.then(
       (v) => { clearTimeout(timer); resolve(v) },
       (e) => { clearTimeout(timer); reject(e) }