fix: remove description field from migration 035 app_settings inserts

The app_settings table doesn't have a description column.
Removed all description fields to prevent migration failures.

This completes the fix for all app_settings inserts across migrations.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

backend/migrations/035_enhance_backup_system.js

@@ -8,44 +8,37 @@ async function up() {
     {
       setting_key: 'backup_s3_force_path_style',
       setting_value: JSON.stringify(false),
-      setting_type: 'backup',
-      description: 'Force path-style S3 URLs (for MinIO/self-hosted)'
+      setting_type: 'backup'
     },
     {
       setting_key: 'backup_s3_ssl_enabled',
       setting_value: JSON.stringify(true),
-      setting_type: 'backup',
-      description: 'Enable SSL/TLS for S3 connections'
+      setting_type: 'backup'
     },
     {
       setting_key: 'backup_s3_prefix',
       setting_value: JSON.stringify(''),
-      setting_type: 'backup',
-      description: 'S3 key prefix for organizing backups'
+      setting_type: 'backup'
     },
     {
       setting_key: 'backup_incremental',
       setting_value: JSON.stringify(false),
-      setting_type: 'backup',
-      description: 'Enable incremental backups'
+      setting_type: 'backup'
     },
     {
       setting_key: 'backup_include_database',
       setting_value: JSON.stringify(true),
-      setting_type: 'backup',
-      description: 'Include database dumps in backups'
+      setting_type: 'backup'
     },
     {
       setting_key: 'backup_encryption_enabled',
       setting_value: JSON.stringify(false),
-      setting_type: 'backup',
-      description: 'Enable backup encryption'
+      setting_type: 'backup'
     },
     {
       setting_key: 'backup_database_schedule',
       setting_value: JSON.stringify(''),
-      setting_type: 'backup',
-      description: 'Separate cron schedule for database-only backups'
+      setting_type: 'backup'
     }
   ];