Add model catalog with specifications for DA3 and MoGe-2 models

- Introduced ModelSpec dataclass to define model attributes.
- Added multiple models including DA3 Small, Base, Giant 1.1, Nested Giant Large 1.1, and MoGe-2 variants.
- Implemented functions to retrieve model details and metadata.
- Included BEN2 model specifications for background removal.

docs/index.md

@@ -7,5 +7,4 @@
 - [Surface](surface.md)：透视网格、Geometry Nodes 后处理与材质法线
 - [输出格式](outputs.md)：Debug 输出类型、参数和任务产物
 - [Job Server](server.md)：Environment、模型缓存、任务目录与运行机制
-- [BlendJob 开发者指南](blendjob.md)：可复用 Job Server、Blender Client 与装饰器注册 API
-- [开发与许可证](development.md)：开发验证、打包、上游版本与许可证
+- [程序设计、开发与许可证](development.md)：模块边界、调用流程、项目结构、常用命令与许可证