feat: 添加Math库和Google Test测试框架

- 新增Math库: Vector2/3/4, Matrix3/4, Quaternion, Transform, Color等
- 新增测试框架: Google Test (gtest)
- 新增140个单元测试，覆盖Vector, Matrix, Quaternion, Geometry
- VolumeRenderer支持vcpkg的NanoVDB
- 添加TESTING.md测试文档

MVS/VolumeRenderer/CMakeLists.txt

@@ -1,6 +1,12 @@
 cmake_minimum_required(VERSION 3.15)
 project(XCVolumeRenderer VERSION 1.0 LANGUAGES CXX)
 
+# ============================================================
+# Vcpkg Integration
+# ============================================================
+set(VCPKG_ROOT "D:/vcpkg")
+set(CMAKE_TOOLCHAIN_FILE "${VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake" CACHE STRING "")
+
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
@@ -28,6 +34,7 @@ target_compile_options(${PROJECT_NAME} PRIVATE /utf-8 /MT)
 
 target_include_directories(${PROJECT_NAME} PRIVATE 
     ${CMAKE_SOURCE_DIR}
+    ${VCPKG_ROOT}/installed/x64-windows/include
 )
 
 target_link_libraries(${PROJECT_NAME} PRIVATE