refactor: System2/3, User Management SSO 인증 통합

- System2 신고: SSO JWT 인증 전환, API base 정리
- System3 부적합: SSO 인증 매니저 통합, 권한 체계 정비
- User Management: SSO 토큰 기반 사용자 관리 API 연동

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

system3-nonconformance/web/static/js/api.js

@@ -53,32 +53,28 @@ const API_BASE_URL = (() => {
 // 토큰 관리 (SSO 쿠키 + localStorage 이중 지원)
 const TokenManager = {
     getToken: () => {
-        // SSO 쿠키 우선 (sso_token), localStorage 폴백 (access_token)
-        return _cookieGet('sso_token') || localStorage.getItem('sso_token') || localStorage.getItem('access_token');
+        // SSO 쿠키 우선, localStorage 폴백
+        return _cookieGet('sso_token') || localStorage.getItem('sso_token');
     },
-    setToken: (token) => localStorage.setItem('access_token', token),
+    setToken: (token) => localStorage.setItem('sso_token', token),
     removeToken: () => {
         _cookieRemove('sso_token');
         _cookieRemove('sso_user');
         _cookieRemove('sso_refresh_token');
-        localStorage.removeItem('access_token');
         localStorage.removeItem('sso_token');
         localStorage.removeItem('sso_user');
     },
 
     getUser: () => {
-        // SSO 쿠키 우선, localStorage 폴백
         const ssoUser = _cookieGet('sso_user') || localStorage.getItem('sso_user');
         if (ssoUser) {
             try { return JSON.parse(ssoUser); } catch(e) {}
         }
-        const userStr = localStorage.getItem('currentUser') || localStorage.getItem('current_user');
-        return userStr ? JSON.parse(userStr) : null;
+        return null;
     },
-    setUser: (user) => localStorage.setItem('current_user', JSON.stringify(user)),
+    setUser: (user) => localStorage.setItem('sso_user', JSON.stringify(user)),
     removeUser: () => {
-        localStorage.removeItem('current_user');
-        localStorage.removeItem('currentUser');
+        localStorage.removeItem('sso_user');
     }
 };