Refactor Cutout and Image Editing Logic

- Renamed "Base Plane Depth" to "Reference Depth" across validate_cutout.py for consistency.
- Introduced a new specification for Cutout mesh sampling to ensure source pixel spacing is preserved and limits are applied correctly.
- Unified naming conventions for image editing results to maintain consistency across Remove Background, Upscale, and Crop operations.
- Updated the handling of Refine Selection to ensure it retains the original bounds and does not apply unnecessary cropping.
- Enhanced material generation logic to connect image color directly to IOR Level, improving the rendering of dark areas.
- Established clear requirements for geometry depth controls and image result materials to ensure consistent behavior across different components.
- Removed outdated logic and ensured all changes are documented and tested for regression.

docs/internals/outputs.md

@@ -8,7 +8,7 @@ Server 在 Job 目录写入图片、JSON 或 Debug NPZ；Blender 根据 Job 返
 |     |     |     |
 | `remove-background` | `image.0001.png` 起 | 替换 Image Empty 的颜色数据 |
 | `upscale-image` | `upscale.0001.png` 起 | 替换或新建高清颜色数据 |
-| `refine-image-selection` | `image.png`、`bounds.json` | Image Box / Lasso 读取 Refine Selection 结果 |
+| `refine-image-selection` | `image.png` | Image Box / Lasso 读取完整 bounds 的 Refine Selection 结果 |
 | `generate-depth-plane-geometry` | `image.0001.*`、`z-depth.exr`、`depth.json` | 创建 Depth Plane |
 | `generate-cutout-artifacts` | 可选 Selection、Depth 与 Normal 文件 | 创建 Cutout Shape 与材质 |
 
@@ -34,12 +34,12 @@ Blender 通过 `common/depth.py` 加载 EXR，设为 Non-Color 并 Pack。Depth
 
 Blender 先把 `SelectionPath` 栅格化为 `SelectionMask`，再把局部 RGBA 作为 Server 输入。MoGe-2 输入统一按 `RGB × Alpha` 合成到黑底；完全透明像素下的隐藏 RGB 不影响预测。Server 不接收 Path 或 Mask 对象协议：
 
-- 开启 Refine Selection 时，`selection.png` 保存细化后的局部 RGBA，`selection_bounds.json` 保存它相对输入裁切图的范围；
+- 开启 Refine Selection 时，`selection.png` 以输入 bounds 的完整尺寸保存 `Source Alpha × BEN2 Alpha` RGBA；
 - 需要 Vector Depth 时请求 `vector-depth.exr` 与 `depth.json`；
 - 需要 Z Depth 时请求 `z-depth.exr` 与 `depth.json`；
 - Normal Map 按空间请求 `tangent-normal.png` 或 `object-normal.png`。
 
-Surface 与 Balloon 的本地路径直接使用 `SelectionMask` 构建 Shape。最终颜色图由 Blender 按 Selection 范围裁切源 Image，并保留源 RGBA。
+Cutout 的 Color、Normal 与 Depth 使用同一图片 Alpha 内容范围；Blender 再将该 Alpha 与 `SelectionMask` 相乘构建 Shape。Surface 与 Balloon 的本地路径直接组合源 Alpha 和 `SelectionMask`。
 
 ## Debug 产物