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/src/Core/FileWriter.cpp

@@ -0,0 +1,50 @@
+#include "Core/FileWriter.h"
+#include <cstring>
+
+namespace XCEngine {
+namespace Core {
+
+FileWriter::FileWriter() = default;
+
+FileWriter::FileWriter(const char* filePath, bool append) {
+    Open(filePath, append);
+}
+
+FileWriter::~FileWriter() {
+    Close();
+}
+
+bool FileWriter::Open(const char* filePath, bool append) {
+    Close();
+    const char* mode = append ? "ab" : "wb";
+    m_file = std::fopen(filePath, mode);
+    return m_file != nullptr;
+}
+
+void FileWriter::Close() {
+    if (m_file) {
+        std::fclose(m_file);
+        m_file = nullptr;
+    }
+}
+
+bool FileWriter::Write(const char* data, size_t length) {
+    if (!m_file || !data || length == 0) {
+        return false;
+    }
+    return std::fwrite(data, 1, length, m_file) == length;
+}
+
+bool FileWriter::Write(const Containers::String& str) {
+    return Write(str.CStr(), str.Length());
+}
+
+bool FileWriter::Flush() {
+    if (!m_file) {
+        return false;
+    }
+    return std::fflush(m_file) == 0;
+}
+
+} // namespace Core
+} // namespace XCEngine