NPC 결정 기록 조회와 월별 인덱스를 연결하고 감사 화면 검증

packages/infra/prisma/game.prisma

@@ -1222,7 +1222,7 @@ model PlayAuditDecision {
   chunks PlayAuditDecisionChunk[]
 
   @@unique([executionId, phase])
-  @@index([serverId, generalId, tick, id])
+  @@index([serverId, generalId, year, month, tick, id], map: "play_audit_decision_general_month_idx")
   @@index([serverId, nationId, tick, id])
   @@map("play_audit_decision")
 }

packages/infra/prisma/migrations/20260916080000_index_play_audit_decision_month/migration.sql

@@ -0,0 +1,2 @@
+CREATE INDEX "play_audit_decision_general_month_idx" ON "play_audit_decision"("server_id", "general_id", "year", "month", "tick", "id");
+DROP INDEX "play_audit_decision_server_id_general_id_tick_id_idx";