fix: address all 11 review items for group-based access control

Bugs fixed:
- knowledgeBase.js: logAudit calls converted from positional args to object signature
- archerTickets.js: targetType/targetId renamed to entityType/entityId
- server.js: single CVE delete now has cascade/compliance check for Standard_User

Unprotected endpoints secured:
- ivantiTodoQueue.js: POST/PUT/DELETE now require Admin or Standard_User
- ivantiFindings.js: PUT note and POST sync now require Admin or Standard_User
- compliance.js: POST notes now requires Admin or Standard_User
- ivantiWorkflows.js: POST sync now requires Admin or Standard_User
- auth.js: cleanup-sessions now requires Admin via requireAuth + requireGroup

Additional fixes:
- ExportsPage.js: canExport() guard blocks Read_Only users
- knowledgeBase.js: Standard_User delete checks created_by ownership
- Migration: added INSERT/UPDATE triggers to enforce valid user_group values

backend/routes/ivantiWorkflows.js

@@ -5,6 +5,7 @@
 
 const express = require('express');
 const https = require('https');
+const { requireGroup } = require('../middleware/auth');
 
 const IVANTI_URL_BASE = 'https://platform4.risksense.com/api/v1';
 const SYNC_INTERVAL_MS = 24 * 60 * 60 * 1000; // 24 hours
@@ -259,7 +260,7 @@ function createIvantiWorkflowsRouter(db, requireAuth) {
     });
 
     // POST /sync — trigger an immediate sync, await completion, return fresh state
-    router.post('/sync', async (req, res) => {
+    router.post('/sync', requireGroup('Admin', 'Standard_User'), async (req, res) => {
         await syncWorkflows(db);
         try {
             res.json(await readState(db));