Add tests for image layer, image plane, inventory, saved layout, commands, documentation, manifest, and packaging

- Implement tests for image layer functionality including alpha curve and depth layer behavior.
- Create tests for image plane evaluation and modifier input handling.
- Add tests to verify the saved asset inventory and its persistence.
- Introduce tests for the documentation command to ensure correct project version deployment.
- Validate the extension manifest structure and required permissions.
- Develop tests for the packaging process, ensuring correct platform handling and dependency management.
- Enhance image depth plane group functionality with new split threshold input and surface processing.

docs/internals/node-assets.md

@@ -2,7 +2,7 @@
 
 ## 构建节点资产
 
-生产节点组由 `uv run build_node` 构建到 `src/anyimage/assets/O_AnyImage.blend`
+生产节点组由 `uv run build_nodes` 构建到 `src/anyimage/assets/O_AnyImage.blend`
 
 节点组文件在 `tools/nodes/groups`
 
@@ -40,8 +40,8 @@
 保存后，`check.py` 在独立 Blender 进程中重新加载资产并做基本几何求值。接口、默认值和详细几何行为由 `tests/` 检查。
 
 ```bash
-uv run build_node --blender "/path/to/blender"
-uv run build_node --skip-tests
+uv run build_nodes --blender "/path/to/blender"
+uv run build_nodes --skip-tests
 ```
 
 脚本按 `--blender`、环境变量 `BLENDER_BIN`、项目 `.env`、`PATH` 的顺序查找 Blender。无法自动找到时，在项目根目录的 `.env` 中配置：