Fix Streaming Paraformer state leakage between sessions

Reset stream state after getting final result to prevent residual
data from appearing at the beginning of the next recording session.

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

Author: ZhaoChaoqun

Sources/RecordingManager.swift

@@ -416,6 +416,9 @@ class RecordingManager {
             // 获取最终结果
             let text = recognizer.getResult()
 
+            // 重置流状态，清空残留数据
+            recognizer.reset()
+
             DispatchQueue.main.async {
                 var finalText: String? = nil
                 if !text.isEmpty {