refactor: 大规模调整项目目录结构，将ChatClient和ChatServer整合为Monorepo结构，并分为两个独立文件夹：chatclient/ 和 chatserver/。更新了ChatClient的CMakeLists.txt配置以适配新结构。

ChatClient/include/verifycodewidget.h

@@ -0,0 +1,32 @@
+#pragma once
+
+#include <QWidget>
+#include <QRandomGenerator>
+
+class VerifyCodeWidget : public QWidget
+{
+	Q_OBJECT
+
+public:
+	explicit VerifyCodeWidget(QWidget *parent = nullptr);
+
+	//通过这个函数生成随机的验证码字符串
+	QString generateVerifyCode();
+
+	//刷新并把当前验证码显示到界面上
+	void refreshVerifyCode();
+
+	//检验验证码是否匹配
+	bool checkVerifyCode(const QString& verifyCode);
+
+	void paintEvent(QPaintEvent* event) override;
+	void mousePressEvent(QMouseEvent* event) override;
+
+private:
+	//随机数生成器
+	QRandomGenerator randomGenerator;
+
+	//保存验证码的值
+	QString verifyCode = "";
+signals:
+};