perf: 1200장수 용량 fixture와 E1 profile을 추가

900 NPC와 300 synthetic 사용자를 5분 턴으로 처리하는 결정론적 engine profile을 추가하고, 전용 PostgreSQL schema와 Redis DB에 300개 인증 session을 준비하는 격리 load fixture를 제공한다.

tools/load-tests/src/config.ts

@@ -39,6 +39,8 @@ export interface LoadConfig {
     isolation: {
         postgresSchema: string;
         redisPrefix: string;
+        redisDatabase: number;
+        profileName: string;
     };
     capacity: {
         authenticatedViewers: number;
@@ -64,7 +66,7 @@ const integerAtLeast = (value: unknown, minimum: number): boolean =>
 const hasOnlyKeys = (value: Record<string, unknown>, allowed: readonly string[]): boolean =>
     Object.keys(value).every((key) => allowed.includes(key));
 
-const isPrivateTargetHost = (hostname: string): boolean => {
+export const isPrivateTargetHost = (hostname: string): boolean => {
     const normalized = hostname.toLowerCase().replace(/^\[|\]$/gu, '');
     if (normalized === 'localhost' || normalized === '::1' || normalized.endsWith('.localhost')) return true;
     if (normalized.endsWith('.internal') || normalized.endsWith('.local')) return true;
@@ -116,13 +118,21 @@ export const validateLoadConfig = (raw: unknown): LoadConfig => {
     if (!isRecord(isolation)) {
         issues.push('isolation must be an object');
     } else {
-        if (!hasOnlyKeys(isolation, ['postgresSchema', 'redisPrefix'])) issues.push('isolation contains unknown fields');
+        if (!hasOnlyKeys(isolation, ['postgresSchema', 'redisPrefix', 'redisDatabase', 'profileName'])) issues.push('isolation contains unknown fields');
         if (typeof isolation.postgresSchema !== 'string' || !/^load_[a-z0-9_]+$/u.test(isolation.postgresSchema)) {
             issues.push('isolation.postgresSchema must start with load_');
         }
         if (typeof isolation.redisPrefix !== 'string' || !/^load-tests:[a-z0-9:_-]+:$/u.test(isolation.redisPrefix)) {
             issues.push('isolation.redisPrefix must be load-tests scoped and end with a colon');
         }
+        if (!integerAtLeast(isolation.redisDatabase, 1) || Number(isolation.redisDatabase) > 15) {
+            issues.push('isolation.redisDatabase must be a dedicated Redis database in the range 1..15');
+        }
+        if (typeof isolation.profileName !== 'string' || !/^load-tests:[a-z0-9:_-]+$/u.test(isolation.profileName)) {
+            issues.push('isolation.profileName must be load-tests scoped');
+        } else if (typeof isolation.redisPrefix === 'string' && `${isolation.profileName}:` !== isolation.redisPrefix) {
+            issues.push('isolation.profileName must match isolation.redisPrefix without the trailing colon');
+        }
     }
 
     const capacity = raw.capacity;