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/web/js/manage-worker.js

@@ -80,10 +80,10 @@ async function loadWorkers() {
     
     if (Array.isArray(list)) {
       list.forEach(item => {
-        const row = createRow(item, ['worker_id', 'worker_name', 'position'], async w => {
+        const row = createRow(item, ['user_id', 'worker_name', 'position'], async w => {
           if (!confirm('삭제하시겠습니까?')) return;
           try {
-            const delRes = await fetch(`${API}/workers/${w.worker_id}`, {
+            const delRes = await fetch(`${API}/workers/${w.user_id}`, {
               method: 'DELETE',
               headers: getAuthHeaders()
             });