fix(xcode): 彻底修复项目自引用

[iamsyc]

变更

• 将 VoidDisplay.xcodeproj 从 Apps/VoidDisplay 同步目录迁移到仓库根目录，消除项目包被同步根组再次纳入的结构条件
• 同步更新 workspace、scheme、test plan、构建脚本、CI、Nightly、Release 与文档路径
• 为项目位置、自引用、旧路径、Xcode 脚本沙箱和首次发布跨路径比较增加静态守卫与 fixture

原因

原工程包位于 PBXFileSystemSynchronizedRootGroup(path = .) 管理的目录中，Xcode 保存工程时会把工程包本身识别为同步内容并写入项目自引用。工程迁移到同步目录之外后，根组仅同步 Apps/VoidDisplay 的应用内容。

本地验证

• scripts/ci/static.sh
• scripts/ci/full_regression.sh --destination "platform=macOS,arch=arm64" --ui-selector "VoidDisplayUITests" --out-dir ".ai-tmp/xcode-project-root-fix/full-regression-final"
• 611 个 Swift 测试、2 个 Go 包、Debug 构建、11 个 UI 测试、arm64 Release smoke 全部通过
• Xcode 26.5 两轮 Command-S、Command-Q 后主进程退出，project.pbxproj 哈希保持一致，自引用字段零匹配

[github-actions]

CI Summary

Run: Open

Check	Status	Details
Change Scope	ui_code	code=true ui=true script=true product=true test=true ci=true release=true dependency=true tooling=false docs_only=false unknown=true
Required Gates	derived	static=true dependency=true unit=true xcode=true ui=true release=true PRs always run static, unit, and xcode build gates.
Dependency Review	success	required=true high and critical vulnerabilities block
Static Checks	success	required=true actionlint, shellcheck, shfmt, SwiftFormat, SwiftLint, action pinning
Unit Tests	success	required=true Swift tests: 611 Go packages: 2 Reason: passed Artifact: unit-gate
Xcode Build	success	required=true Debug build with zero warning scan Artifact: xcode-build
UI Smoke	success	required=true Failure classification is written by ui-smoke-summary.json in each artifact. Artifacts: ui-smoke-baseline, ui-smoke-listLayout, ui-smoke-listNarrow, ui-smoke-previewRecovery, ui-smoke-previewWindowPayload
Release Smoke	success	required=true arm64=success intel64=skipped PR release smoke requires arm64 only. Artifacts: release-smoke-arm64 Release verify summaries are produced by release.yml before publishing.
Artifacts	link	Open artifacts
CI Gate	success	single branch protection check