feat: 实现日志与调试系统(Debug模块)

- LogLevel: 日志级别枚举 (Verbose, Debug, Info, Warning, Error, Fatal)
- LogCategory: 日志分类 (General, Rendering, Physics, Memory, Threading等)
- ILogSink: 日志输出接口
- ConsoleLogSink: 控制台输出, 支持Windows颜色
- FileLogSink: 文件日志输出
- FileWriter: 文件写入器
- Logger: 日志管理器, 支持多sink, 分类控制
- Profiler: 性能分析器
- 单元测试覆盖

engine/include/XCEngine/Debug/FileLogSink.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "ILogSink.h"
+#include "LogEntry.h"
+#include "../Containers/String.h"
+#include "../Core/FileWriter.h"
+
+namespace XCEngine {
+namespace Debug {
+
+class FileLogSink : public ILogSink {
+public:
+    FileLogSink(const Containers::String& filePath);
+    ~FileLogSink() override;
+
+    void Log(const LogEntry& entry) override;
+    void Flush() override;
+
+private:
+    Containers::String m_filePath;
+    Core::FileWriter m_writer;
+};
+
+} // namespace Debug
+} // namespace XCEngine