refactor(migrations): core 마이그레이션 경로 db/migrations/core → migrations/core 단축

apps/api/src/db/migrations/core 의 불필요한 db/ 계층 제거.
app.ts·setup.ts 경로 참조 동일하게 수정.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: SOIV

apps/api/src/app.ts

@@ -155,7 +155,7 @@ export async function initDb(): Promise<DbProvider> {
 
 export async function runMigrations(db: DbProvider): Promise<void> {
   const { FileMigrationRunner } = await import('@fieldstack/core');
-  const coreDir = path.join(__dirname, 'db', 'migrations', 'core');
+  const coreDir = path.join(__dirname, 'migrations', 'core');
   const runner = new FileMigrationRunner(db, 'core', coreDir);
   await runner.run();
 }

…c/db/migrations/core/001_auth_schema.sql …/src/migrations/core/001_auth_schema.sqlapps/api/src/db/migrations/core/001_auth_schema.sql renamed to apps/api/src/migrations/core/001_auth_schema.sql apps/api/src/db/migrations/core/001_auth_schema.sql renamed to apps/api/src/migrations/core/001_auth_schema.sql

@@ -237,8 +237,8 @@ export function createSetupRouter(): Router {
       currentStep = 'db_migrate';
       emit({ step: 'db_migrate', status: 'running', message: '마이그레이션을 적용하는 중...' });
       const { FileMigrationRunner } = await import('@fieldstack/core');
-      // __dirname: apps/api/src/routes → ../db/migrations/core
-      const coreDir = path.join(__dirname, '..', 'db', 'migrations', 'core');
+      // __dirname: apps/api/src/routes → ../migrations/core
+      const coreDir = path.join(__dirname, '..', 'migrations', 'core');
       const runner = new FileMigrationRunner(db, 'core', coreDir);
       await runner.run();
       emit({ step: 'db_migrate', status: 'done', message: '마이그레이션 완료' });