Making zone management more efficient with batch DNS record updates

Introduced a new /dns_records/batch API endpoint that allows for multiple DNS record operations (POST, PUT, PATCH, DELETE) in a single API call, executed within a database transaction. Optimized database queries by removing redundant existence checks and leveraging PostgreSQL's auto_explain for latency analysis. Implemented a specific execution order for operations (deletes, patches, puts, posts) to handle conflicts. Added UI support in the dashboard for batch deletion and proxy status changes of selected DNS records.