Add specifications for two-times upscale and unified depth plane features

- Introduced the two-times upscale specification detailing requirements for unified output, fixed model presets, arbitrary dimensions, and consistent job behavior.
- Added scenarios for existing models, repeated upscale, and handling of alpha preservation.
- Created the unified depth plane specification outlining geometry modes, stable interface, and asset evaluation.
- Defined scenarios for mode switching, relief and camera preservation, and validation of delivered assets.
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# panorama-geometry-generation Specification
## Purpose
TBD - created by archiving change add-panorama-conversion. Update Purpose after archive.
## Requirements
### Requirement: Generate panoramic radial distance
Server SHALL 从当前 RGBA 全景生成 12 个重叠的 90 度透视视图,使用已知 FOV 恢复 MoGe2 几何并融合为横向周期的径向距离场。
#### Scenario: Continuous panorama
- **WHEN** 输入包含跨越 U=0/1 的连续表面
- **THEN** 两侧使用同一周期求解,产出有限正距离且无额外拼接断层
#### Scenario: Invalid views and cancellation
- **WHEN** 部分视图全透明或模型无有效预测
- **THEN** 利用其余有效观测完成融合,全局无有效几何时返回明确错误,并在视图与融合阶段响应取消
### Requirement: Export combined depth alpha
系统 SHALL 返回颜色文件、`depth.exr` 与 `depth.json`。深度 RGB 保存径向距离,Alpha 在导出时一次合成融合 Mask × 源 Alpha;元数据 SHALL 标明等距柱状投影、深度图尺寸和参考距离。
#### Scenario: Transparent background
- **WHEN** 源图某区域 Alpha 为零
- **THEN** 该区域深度 EXR Alpha 为零,颜色文件保留源 Alpha
#### Scenario: Fractional alpha
- **WHEN** 有效模型 Mask 为 1 且源 Alpha 为 0.5
- **THEN** 深度导出 Alpha 为 0.5,几何端直接消费该值
### Requirement: Use managed production runtime
全景生成 SHALL 使用现有模型会话、Preferences 配置和 Job 生命周期;Job 参数可序列化,Server 与 Blender 数据保持进程边界。
#### Scenario: Configured inference
- **WHEN** 用户修改模型或推理分辨率级别后发起转换
- **THEN** 新任务采用配置值,最终网格细分仍由独立 Subdivide 参数控制