Feat: window capture via PrintWindow with server-side HWND routing by clientID

client/ScreenCapture.h

@@ -170,6 +170,7 @@ public:
 
     // 感兴趣区域 (ROI)
     RECT            m_ROI = {0,0,0,0};
+    bool            m_bNeedRestart = false; // 捕获对象需要重建（如窗口尺寸变化）
     int             m_nScaleSendWidth  = 0;
     int             m_nScaleSendHeight = 0;
 
@@ -859,6 +860,7 @@ public:
     void ensureEncoder(int width, int height)
     {
         if (m_encoder) return;
+        if (width < 2 || height < 2) return; // x264 做偶数对齐 &~1，1→0，触发内部 strdup 泄漏；< 2 一并拦住
         EncoderRequest req;
         req.width        = width;
         req.height       = height;