Upgrade allow adding image in ticket details page comment section

app/routes/admin.py

@@ -741,4 +741,38 @@ def activity_logs():
 
 
 def _roles():
-    return [UserRole.EMPLOYEE, UserRole.IT_STAFF, UserRole.ADMIN]
+    return [UserRole.EMPLOYEE, UserRole.IT_STAFF, UserRole.ADMIN]
+
+
+@admin_bp.route('/settings', methods=['GET', 'POST'])
+@admin_required
+def settings():
+    from app.models import SystemSetting
+
+    if request.method == 'POST':
+        new_value = '1' if request.form.get('registration_enabled') == '1' else '0'
+        old_value = SystemSetting.get('registration_enabled', 'true')
+        SystemSetting.set(
+            'registration_enabled',
+            new_value,
+            'Allow new users to self-register via /auth/register'
+        )
+        db.session.commit()
+
+        state_label = 'enabled' if new_value == '1' else 'disabled'
+        log_action(
+            current_user.id,
+            'setting_update',
+            'system_setting',
+            None,
+            f'registration_enabled changed from {old_value} to {new_value} by admin_id={current_user.id}'
+        )
+        logger.info(
+            f'[ADMIN SETTINGS] registration_enabled={new_value} '
+            f'by admin_id={current_user.id} email={current_user.email}'
+        )
+        flash(f'User registration has been {state_label}.', 'success')
+        return redirect(url_for('admin.settings'))
+
+    registration_enabled = SystemSetting.get_bool('registration_enabled', default=True)
+    return render_template('admin/settings.html', registration_enabled=registration_enabled)