refactor: 重构项目结构为 MVS 多示例版本，添加 README 文档

MVS/ui/src/Managers/LogSystem.cpp

@@ -0,0 +1,19 @@
+#include "LogSystem.h"
+
+namespace UI {
+
+LogSystem& LogSystem::Get() {
+    static LogSystem instance;
+    return instance;
+}
+
+void LogSystem::AddLog(LogEntry::Level level, const std::string& message) {
+    m_logs.push_back({level, message});
+    if (m_callback) m_callback();
+}
+
+void LogSystem::Clear() {
+    m_logs.clear();
+}
+
+}