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/loginwidget.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <QWidget>
+#include <QGridLayout>
+#include <QLabel>
+#include <QLineEdit>
+#include <QPushButton>
+
+#include "phoneloginwidget.h"
+#include "verifycodewidget.h"
+#include "toast.h"
+
+class LoginWidget : public QWidget
+{
+	Q_OBJECT
+
+public:
+	explicit LoginWidget(QWidget *parent);
+
+	void switchMode();
+
+	void clickSubmitBtn();
+	void userLoginDone(bool ok, const QString& reason);
+	void userRegisterDone(bool ok, const QString& reason);
+
+private:
+	bool isLoginMode = true;
+	QLabel* titleLabel;
+
+	QLineEdit* usernameEdit;
+	QLineEdit* passwordEdit;
+	QLineEdit* verifyCodeEdit;
+	VerifyCodeWidget* verifyCodeWidget;
+
+	QPushButton* submitBtn;
+	QPushButton* phoneModeBtn;
+	QPushButton* switchModeBtn;
+};