[Domain] Optimize hazard runtime field

[SilverSupplier]

Summary

• Add shared smooth hazard influence for fire/smoke slowdown, route penalty, and hazard overlay falloff.
• Extend active hazard ECS resource with dirty signatures, floor spatial cells, and candidate queries.
• Add exposure-based route penalties, cached hazard-aware exit choice, and budgeted hazard-aware replanning.
• Keep hazard-aware route selection from reverting to unsafe original exits while hazards remain active.

Related Issue

• Closes Task-시나리오 요소 런타임 안전 우선순위 최적화 #258
• Closes Task-Hazard 런타임 위험장 ECS 최적화 #259

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

Risks / Follow-up

• Hazard modeling remains the planned v1 radial continuous field, not an FDS/grid field.