feat: Add script to clear chunked upload sessions and enhance upload routes

Commit notes

This commit introduces a new script for clearing all chunked upload sessions from Redis, providing a nuclear option for managing stuck sessions. Additionally, it updates the upload routes to include a DELETE endpoint for forcefully clearing all chunked sessions and refines the existing cleanup logic to handle abandoned uploads more effectively. The frontend is also enhanced with a file dropzone for uploading audio files, integrating the new upload functionality and improving user experience.