Server-side upload processing moved out of platform's core/uploads.ts.
Image upload kinds (directory, mount path, URL scheme, layout) are no
longer hardcoded in the package - configureImageUploadKinds/
bootstrapUploadsConfig register them from the app's own
.trebired/uploads/config.ts or programmatically, keeping the package
product-agnostic. getUploadStaticMounts is dropped: it had zero
consumers anywhere.