refactor: worker_id → user_id 전체 마이그레이션 (Phase 1-4)

sso_users.user_id를 단일 식별자로 통합. JWT에서 worker_id 제거,
department_id/is_production 추가. 백엔드 15개 모델, 11개 컨트롤러,
4개 서비스, 7개 라우트, 프론트엔드 32+ JS/11+ HTML 변환.

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

system1-factory/api/models/pageAccessModel.js

@@ -139,13 +139,13 @@ const PageAccessModel = {
         u.name,
         u.role_id,
         r.name as role_name,
-        u.worker_id,
+        u.user_id as worker_user_id,
         w.worker_name,
         w.job_type,
         COUNT(upa.page_id) as granted_pages_count
       FROM users u
       LEFT JOIN roles r ON u.role_id = r.id
-      LEFT JOIN workers w ON u.worker_id = w.worker_id
+      LEFT JOIN workers w ON u.user_id = w.user_id
       LEFT JOIN user_page_access upa ON u.user_id = upa.user_id AND upa.can_access = 1
       WHERE u.is_active = 1
         AND u.role_id IN (4, 5)