refactor(engine): replace legacy football simulation with LoL engine for AI matches

[NicoRuedaA]

Summary

The engine::simulate() / engine::simulate_with_rng() functions are a football simulation engine that uses halves, stoppage time, and football-specific terminology. It is still used by ofm_core::turn::simulate_other_matches() to simulate AI-vs-AI matches.

Two approaches:

Option A: Replace with LoL engine

Replace engine::simulate() calls in ofm_core::turn::mod.rs with LiveMatchState::run_to_completion() or equivalent LoL simulation. This removes the legacy engine entirely.

Option B: Clean up legacy engine

Rename all football concepts in engine::simulate_with_rng() to LoL equivalents:

• "first half" / "second half" -> phase-based progression
• "stoppage time" -> remove or rename
• Zone-based resolution (attacking box, midfield, etc.) -> LoL map zones

Affected files

• engine/src/engine/mod.rs: simulate_with_rng() implementation
• engine/src/engine/resolution.rs: Zone-based action resolution
• ofm_core/src/turn/mod.rs: Lines 684, 1227, 1251, 1260 calling engine::simulate()
• engine/src/lib.rs: Public exports
• engine/tests/simulation_tests.rs: All tests for the legacy engine

Build Verification

• cargo build -p engine
• cargo build -p ofm_core
• cargo test -p engine
• cargo test -p ofm_core

[NicoRuedaA]

Covered by Phase 1 split issues #125-#128 (PRs #121-#124). See #125 for Champions/CI/types, #126 for domain/DB cleanup, #127 for engine migration, #128 for frontend/TeamRoles.