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-api/src/battleSim/environment.ts

@@ -31,6 +31,16 @@ const resolveNumber = (record: Record<string, unknown>, keys: string[], fallback
     return fallback;
 };
 
+const resolveOptionalString = (record: Record<string, unknown>, keys: string[]): string | null => {
+    for (const key of keys) {
+        const value = record[key];
+        if (typeof value === 'string' && value.trim().length > 0) {
+            return value;
+        }
+    }
+    return null;
+};
+
 const resolveUnitSetName = (worldState: WorldStateRow, fallback: string): string => {
     const config = asRecord(worldState.config);
     const environment = asRecord(config.environment ?? config.map);
@@ -88,6 +98,7 @@ export interface BattleSimEnvironment {
     config: WarEngineConfig;
     startYear: number;
     scenarioEffect: ScenarioEffectKey | null;
+    defaultSpecialDomestic: string;
 }
 
 export const buildBattleSimSeedBase = (request: Pick<BattleSimRequestPayload, 'seed'>): string | null =>
@@ -133,6 +144,7 @@ export const buildBattleSimEnvironment = async (
         config,
         startYear: resolveStartYear(worldState),
         scenarioEffect: normalizeScenarioEffect(scenarioEnvironment.scenarioEffect),
+        defaultSpecialDomestic: resolveOptionalString(constValues, ['defaultSpecialDomestic']) ?? 'None',
     };
 };
 

app/game-api/src/router/battle/index.ts

@@ -109,6 +109,7 @@ export const battleRouter = router({
             config: environment.config,
             unitSet: environment.unitSet,
             scenarioEffect: environment.scenarioEffect,
+            defaultSpecialDomestic: environment.defaultSpecialDomestic,
             nationTypes: traits.nationTypes,
             eventDomesticTraits: traits.eventDomesticTraits,
             warTraits: traits.warTraits,

app/game-api/test/battleSimRouter.test.ts

@@ -319,7 +319,10 @@ describe('battle router orchestration', () => {
             currentYear: 200,
             currentMonth: 1,
             tickSeconds: 600,
-            config: { environment: { scenarioEffect: 'event_MoreEffect' } },
+            config: {
+                environment: { scenarioEffect: 'event_MoreEffect' },
+                const: { defaultSpecialDomestic: 'che_event_신산' },
+            },
             meta: { scenarioMeta: { startYear: 180 } },
             updatedAt: new Date('2026-01-01T00:00:00Z'),
         };
@@ -339,6 +342,7 @@ describe('battle router orchestration', () => {
         expect(context).toMatchObject({
             world: { startYear: 180, currentYear: 200, currentMonth: 1 },
             scenarioEffect: 'event_MoreEffect',
+            defaultSpecialDomestic: 'che_event_신산',
             config: { armPerPhase: 500, maxTrainByWar: 110, maxAtmosByWar: 150 },
         });
         expect(context.unitSet.crewTypes?.[0]).toMatchObject({