[Domain] Extend two-floor demo and fix route replanning

[95x8x9]

Summary

• add and refine the built-in two-floor demo workflow, including recent-project wiring and editable demo layout data
• persist additional workspace/scenario state needed by the current authoring flow
• fix route segment replanning so waypoint metadata vectors stay aligned and no longer trigger the MSVC cannot seek vector iterator after end assertion

Related Issue

• Closes [Domain] 시뮬레이션 경로 재계산 중 waypoint 벡터 길이 불일치로 디버그 어설션 발생 #162

Area

• Domain
• Application
• Engine
• Docs
• Build
• Analysis
• Chore

Architecture Check

• I kept the dependency direction application -> domain -> engine.
• I did not add Qt UI code to src/domain.
• I did not add domain or application dependencies to src/engine.
• I used src/ as the include root.

Verification

• cmake --build --preset build-no-app-debug
• ctest --preset test-no-app-debug
• cmake --build --preset build-debug --clean-first
• cmake --preset windows-debug
• ctest --preset test-debug
• Not run (reason below)

Reason:

• I validated the no-app test path and the Qt app build locally, but did not run the full test-debug preset.

Risks / Follow-up

• This PR is based on codex/exit-reroute and is intended to merge into that branch first.
• The diff intentionally includes the currently paired application/domain workspace changes because the verified app build depends on them moving together.