feat: Implement cutout tool and depth generation features

- Added a new cutout tool for selecting regions in images, allowing users to choose mesh shapes based on selected areas.
- Introduced depth generation capabilities for rasterized images, including normal data extraction.
- Created jobs for generating depth planes and region data, enhancing the AI data generation workflow.
- Developed a selection refinement process for cutout regions, improving accuracy in generated outputs.
- Established a new region module for handling rasterized image regions and their associated AI generation tasks.
- Enhanced node graph builders for asset generation, facilitating smoother integration of new features.

docs/internals/index.md

@@ -39,10 +39,11 @@ flowchart TD
 ## 文档分层
 
 - [程序架构](architecture.md)：注册、配置、线程和模块边界。
+- [Common 公共函数](common.md)：仅列生产功能从 `operators/common/` 外部调用的函数。
 - [Job Runtime 与 Server](runtime.md)：任务生命周期、媒体输入和模型 Session。
 - [Operator 实现索引](operators/index.md)：按 `src/anyimage/operators/` 中的完整功能拆分实现页。
 - [Job 产物](outputs.md)：文件用途和 Blender 导入关系。
 - [开发与发布](development.md)：本地环境、测试、打包和 CI。
 - [节点资产](node-assets.md)：Geometry Nodes 的构建、加载与验证。
 
-内部实现文档描述模块之间的职责和主要数据流。函数级分支、参数校验与异常处理以源码和测试为准，避免文档重复实现细节。
+内部实现文档描述模块之间的职责和主要数据流。[Common 公共函数](common.md)按真实外部调用列出开发新功能时应优先复用的稳定入口；函数级分支、参数校验与异常处理仍以源码和测试为准。