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/archerTickets.js

@@ -89,8 +89,8 @@ function createArcherTicketsRouter(db) {
         logAudit(db, {
           userId: req.user.id,
           action: 'CREATE_ARCHER_TICKET',
-          targetType: 'archer_ticket',
-          targetId: this.lastID,
+          entityType: 'archer_ticket',
+          entityId: String(this.lastID),
           details: { exc_number, archer_url, status: validatedStatus, cve_id, vendor },
           ipAddress: req.ip
         });
@@ -172,8 +172,8 @@ function createArcherTicketsRouter(db) {
           logAudit(db, {
             userId: req.user.id,
             action: 'UPDATE_ARCHER_TICKET',
-            targetType: 'archer_ticket',
-            targetId: id,
+            entityType: 'archer_ticket',
+            entityId: String(id),
             details: { before: existing, changes: req.body },
             ipAddress: req.ip
           });
@@ -195,8 +195,8 @@ function createArcherTicketsRouter(db) {
       logAudit(db, {
         userId: req.user.id,
         action: 'DELETE_ARCHER_TICKET',
-        targetType: 'archer_ticket',
-        targetId: id,
+        entityType: 'archer_ticket',
+        entityId: String(id),
         details: { deleted: ticket },
         ipAddress: req.ip
       });