fix: 修复 UI 导航流程，添加 Debug.Log 完整日志

- 重写 PageController.cs，为所有按钮回调添加完整 Debug.Log
- 自动修复 _btnFixationBack：未赋值时自动查找 FixationPanel/BtnBack
- 自动修复 _btnExperimentBack：未赋值时自动查找 ExperimentPanel/Navbar/BtnBack
- 删除失效的 Canvas 根级冗余 BtnFixationBack
- 添加 3D 角色模型资源（man/woman 模型、动画、TextMesh Pro）
- 添加 ExperimentPanel UI 资源和 TrainingBackground 素材

测试方法：进入 Play 模式，查看 Console 以验证每个按钮的绑定状态和点击回调是否正常触发。

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