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

AiAnalysis.pro

@@ -0,0 +1,24 @@
+QT       += core gui network
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
+
+TARGET = AiAnalysis
+TEMPLATE = app
+
+CONFIG += c++11
+
+# Qt 5.9 兼容，不使用 c++17
+*-g++*: QMAKE_CXXFLAGS += -std=c++11
+*-msvc*: QMAKE_CXXFLAGS += /std:c++11
+
+SOURCES += \
+    main.cpp \
+    mainwindow.cpp \
+    udpreceiver.cpp \
+    plotwidget.cpp \
+    datamanager.cpp
+
+HEADERS += \
+    mainwindow.h \
+    udpreceiver.h \
+    plotwidget.h \
+    datamanager.h