refactor：重构项目架构为分层结构

## 🏗️ 主要变更

### 目录结构重构
- 将 core/ 迁移到 _Core/（框架层）
- 将 scenes/ 重构为 Scenes/（玩法层）和 UI/（界面层）
- 将 data/ 迁移到 Config/（配置层）
- 添加 Assets/ 资源层和 Utils/ 工具层
- 将 scripts/ 迁移到 tools/（开发工具）

### 架构分层
- **_Core/**: 框架层 - 全局单例和管理器
- **Scenes/**: 玩法层 - 游戏场景和实体
- **UI/**: 界面层 - HUD、窗口、对话系统
- **Assets/**: 资源层 - 精灵图、音频、字体
- **Config/**: 配置层 - 游戏配置和本地化
- **Utils/**: 工具层 - 通用辅助脚本

### 文件更新
- 更新 project.godot 中的所有路径引用
- 更新自动加载脚本路径
- 更新测试文件的引用路径
- 添加 REFACTORING.md 详细说明
- 添加 MIGRATION_COMPLETE.md 迁移完成标记
- 更新 README.md 反映新架构

### 设计原则
- ✅ 清晰的分层（框架/玩法/界面）
- ✅ 场景内聚（脚本紧邻场景文件）
- ✅ 组件化设计（可复用组件）
- ✅ 职责单一（每个目录职责明确）

## 📋 详细信息
查看 REFACTORING.md 了解完整的重构说明和迁移映射表

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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