修复 lewan 换绑：旧号被 CT 回收时自动新取号出链

退号失败（含权限不足）不再卡住换绑，默认跳过并重新取号生成绑链；
CT 错误返回补充账号/vn 诊断信息，避免误判为后台角色权限问题。

apps/backend/src/services/platforms/cloudtentacles/virtual-number-service.ts

@@ -181,8 +181,16 @@ export async function getCloudtentaclesBindUrl(payload: JsonObject = {}) {
     method: 'POST',
     token,
     body: { id, key },
-    businessErrorStatusCode: 401,
+    businessErrorStatusCode: 409,
     businessErrorCode: 'cloudtentacles_vn_bind_url_failed',
+    sourceKey: payload.sourceKey || payload.resolvedSourceKey,
+    accountLabel: payload.accountLabel,
+    context: {
+      operation: 'vn_bind_url',
+      vnKey: key,
+      vnId: id,
+      sourceKey: payload.sourceKey || payload.resolvedSourceKey || '',
+    },
   })
 
   return {
@@ -340,8 +348,17 @@ export async function backCloudtentaclesVirtualNumber(payload: JsonObject = {})
     method: 'POST',
     token,
     body: { key, id },
-    businessErrorStatusCode: 401,
+    // 409：业务失败，避免前端/客服误判为后台登录或角色权限问题
+    businessErrorStatusCode: 409,
     businessErrorCode: 'cloudtentacles_vn_back_failed',
+    sourceKey: payload.sourceKey || payload.resolvedSourceKey,
+    accountLabel: payload.accountLabel,
+    context: {
+      operation: 'vn_back',
+      vnKey: key,
+      vnId: id,
+      sourceKey: payload.sourceKey || payload.resolvedSourceKey || '',
+    },
   })
 
   return {