[Domain] Add fire and smoke scenario hazards

[SilverSupplier]

Summary

• Add fire/smoke hazards as v1 scenario input elements on EnvironmentState.
• Persist hazards in project workspace JSON and include them in scenario diff keys.
• Expose Hazards in scenario authoring with canvas toolbar Fire/Smoke tools that place hazards at specific clicked locations, list edit/delete support, and Smoke visibility-context copy.

Related Issue

• Closes Task-화재/연기 시나리오 입력 요소 v1 구현 #207

Area

• Engine
• Domain
• Application
• 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 --preset windows-debug
• cmake --build --preset build-debug
• ctest --preset test-debug
• Not run (reason below)

All verification commands passed using the Visual Studio bundled CMake/CTest executables because cmake was not on PATH.

Risks / Follow-up

• Hazards are authoring/persistence inputs only in v1; no fire spread, smoke concentration, FED/FDS, or runtime physics effect is implemented.