fix(cpa): clarify multithread callback warning

content/vps-panel.js

@@ -449,7 +449,7 @@ function getStep10BrowserSwitchRequiredMessage(diagnostics = {}) {
   const callbackFailureText = normalizeStep9StatusText(diagnostics?.callbackFailureText || '');
   return [
     '检测到 CPA 页面同时显示“认证成功”和“回调 URL 提交失败: 请更新CLI Proxy API或检查连接”。',
-    '这类冲突状态通常通过更换浏览器可以解决，请更换浏览器后重新进行注册登录。',
+    '这通常不是浏览器问题，而是 CPA 项目会清理多线程 OAuth 会话。CPA 项目无法使用多线程，请修改 CPA 服务器或改为单线程注册。',
     callbackFailureText ? `面板原文：${callbackFailureText}` : '',
   ].filter(Boolean).join(' ');
 }

tests/step9-status-diagnostics.test.js

@@ -205,7 +205,7 @@ test('step 10 explains callback upgrade hint with user-friendly reason', () => {
   assert.match(explanation.userMessage, /回调提交阶段/);
 });
 
-test('step 10 requests browser switch when success badge and callback upgrade failure coexist', () => {
+test('step 10 warns about CPA multithread cleanup when success and callback failure coexist', () => {
   const api = createApi();
   const diagnostics = api.buildStep9StatusDiagnostics(
     [
@@ -231,5 +231,6 @@ test('step 10 requests browser switch when success badge and callback upgrade fa
   );
 
   assert.equal(api.isStep10BrowserSwitchRequiredConflict(diagnostics), true);
-  assert.match(api.getStep10BrowserSwitchRequiredMessage(diagnostics), /更换浏览器后重新进行注册登录/);
+  assert.match(api.getStep10BrowserSwitchRequiredMessage(diagnostics), /CPA 项目无法使用多线程/);
+  assert.match(api.getStep10BrowserSwitchRequiredMessage(diagnostics), /单线程注册/);
 });