fix: 전투 시뮬레이터 기본 특기 계약 복원

Ref와 같이 시나리오 defaultSpecialDomestic을 공격자와 수비자 payload에 적용한다. 기본 5병종 5x5 고정 seed Ref 차등 회귀와 API·Chromium 회귀를 추가한다.

app/game-frontend/src/utils/battleSimulatorTypes.ts

@@ -52,6 +52,7 @@ export type BattleSimOptions = {
     config: WarEngineConfig;
     unitSet: UnitSetDefinition;
     scenarioEffect: string | null;
+    defaultSpecialDomestic: string;
     nationTypes: Array<{ key: string; name: string; info: string }>;
     eventDomesticTraits: Array<{ key: string; name: string; info: string }>;
     warTraits: Array<{ key: string; name: string; info: string }>;

app/game-frontend/src/views/BattleSimulatorView.vue

@@ -461,7 +461,7 @@ const buildGeneralPayload = (
         personal: general.personal,
         // Ref does not expose the domestic speciality in this form. Battle requests
         // always use the scenario's default domestic speciality instead.
-        special: options.value?.eventDomesticTraits[0]?.key ?? general.special,
+        special: options.value?.defaultSpecialDomestic ?? 'None',
         special2: general.special2,
         crew: general.crew,
         crewtype: general.crewtype,