Feature Requests: Overwrite Original Files and Custom Concurrent Processing

[Coinerakfff]

Feature Request 1: Add an “Overwrite Original Files” Option
Current: Compressed files can only be saved to a new output location, so the original files have to be replaced manually.
Requested: Add an optional setting that allows compressed files to automatically overwrite the original files once processing is complete.

Feature Request 2: Allow Custom Image Processing Concurrency
Current: The number of images processed at the same time is fixed, which limits efficiency when handling large batches.
Requested: Add a setting that lets users choose how many image-processing tasks can run concurrently.