NetworkView: API routing fix, logout button, audit trail, port/notes editor tracking

- Fix frontend API base path (VITE_API_BASE env var, GraphPage hardcoded /api)
- Add logout button to NetworkView sidebar (clears portal SSO)
- Add AuditTrail component: inline change history on all entity pages
- DB migration: add updated_at, last_edited_by to ports table
- DB migration: add notes_last_edited_by, notes_updated_at to all entity tables
- Backend: track actor on port create/update; notes editor on entity PUT
- Frontend: extend types, MarkdownEditor shows last editor, port modal/list show last editor
- Fix port CREATE TABLE definition to include new columns upfront
- Add try/catch in handleSavePort to surface API errors in modal

digiserver-v2/app/blueprints/auth.py

@@ -34,12 +34,12 @@ def login():
 @auth_bp.route('/logout')
 @login_required
 def logout():
-    """User logout"""
+    """Log out of DigiServer and redirect to portal logout to clear the SSO cookie."""
     username = current_user.username
     logout_user()
     log_action('info', f'User {username} logged out')
-    flash('You have been logged out.', 'info')
-    return redirect(url_for('auth.login'))
+    portal_logout = current_app.config.get('PORTAL_LOGOUT_URL', 'http://localhost:8080/logout')
+    return redirect(portal_logout)
 
 
 @auth_bp.route('/register', methods=['GET', 'POST'])