Refactor: Transition to unified upload system and remove legacy chunked session management

Commit notes

This commit introduces a unified upload system that consolidates chunked and resumable uploads into a single flow, supporting files up to 5GB with improved session management. The legacy chunked upload scripts and session handling have been removed, and new scripts for clearing upload sessions have been added. The upload routes have been updated to reflect this change, ensuring backward compatibility with legacy routes. Additionally, the pnpm-lock.yaml has been updated to reflect dependency changes and version upgrades.