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.

openspec/specs/server-lifecycle-controls/spec.md

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+# server-lifecycle-controls Specification
+
+## Purpose
+TBD - created by archiving change show-server-controls-while-running. Update Purpose after archive.
+## Requirements
+### Requirement: Running Server lifecycle controls
+Server 面板 SHALL 在 Server 的每个 Running 子状态下显示重启和停止控制，并 SHALL 保留该子状态对应的状态文本与图标。
+
+#### Scenario: Server is running and waiting
+- **WHEN** Server 状态为 `READY`
+- **THEN** 面板显示 Running 状态、重启按钮和停止按钮
+
+#### Scenario: Server is running and busy
+- **WHEN** Server 状态为 `BUSY`
+- **THEN** 面板显示 Running (Busy) 状态、重启按钮和停止按钮
+
+#### Scenario: Server is not running
+- **WHEN** Server 状态不是 Running 子状态
+- **THEN** 面板不显示 Running 状态的重启和停止按钮，并沿用该状态对应的现有控制或提示
+