refactor: 改用qmake(.pro)构建，兼容Qt 5.9

- 移除CMakeLists.txt，改用AiAnalysis.pro
- 修复Qt 5.9兼容性：QWheelEvent::posF()、QString::SkipEmptyParts、static_cast信号连接
- 更新README为qmake构建说明
- 删除CMake build目录

plotwidget.cpp

@@ -394,7 +394,7 @@ void PlotWidget::drawLegend(QPainter &painter)
 void PlotWidget::wheelEvent(QWheelEvent *event)
 {
     QRectF area = plotArea();
-    if (!area.contains(event->position())) return;
+    if (!area.contains(event->posF())) return;
 
     double zoomFactor = 1.15;
     if (event->angleDelta().y() < 0) {