improve embedded scanner runtime

common/callback.go

@@ -17,23 +17,6 @@ func SetResultCallback(cb ResultCallback) {
 	resultCallback = cb
 }
 
-// ReplaceResultCallback temporarily replaces the result callback and returns a
-// restore function. This is useful for embedded callers that need to collect
-// structured results without permanently stealing the callback from another
-// subsystem.
-func ReplaceResultCallback(cb ResultCallback) func() {
-	callbackMu.Lock()
-	previous := resultCallback
-	resultCallback = cb
-	callbackMu.Unlock()
-
-	return func() {
-		callbackMu.Lock()
-		resultCallback = previous
-		callbackMu.Unlock()
-	}
-}
-
 // NotifyResult 通知结果给回调函数
 func NotifyResult(result interface{}) {
 	callbackMu.RLock()