Key points:\n- restore the tests tree removed by bc47e6e\n- capture current editor workspace, scene, and docs reshuffle changes\n- keep local cloud.nvdb resources ignored from this commit
- 新增 Platform 模块：PlatformTypes.h, Window.h, WindowsWindow - 新增 Input 模块：InputTypes, InputEvent, InputAxis, InputModule, InputManager - 新增 WindowsInputModule 处理 Win32 消息转换 - 将 RHI 集成测试从 render_model 迁移到 sphere - 更新 CMakeLists.txt 添加 Platform 和 Input 模块
