feat: add S3-compatible storage provider (MinIO, Ceph, R2, etc.)

Adds a new 'S3-Compatible Storage' provider that works with any
S3-API-compatible object storage service, including MinIO, Ceph,
Cloudflare R2, Backblaze B2, and others.

Changes:
- New provider class: classes/providers/storage/s3-compatible-provider.php
  - Provider key: s3compatible
  - Reads user-configured endpoint URL from settings
  - Uses path-style URL access (required by most S3-compatible services)
  - Supports credentials via AS3CF_S3COMPAT_ACCESS_KEY_ID /
    AS3CF_S3COMPAT_SECRET_ACCESS_KEY wp-config.php constants
  - Disables AWS-specific features (Block Public Access, Object Ownership)
- New provider SVG icons (s3compatible.svg, -link.svg, -round.svg)
- Registered provider in main plugin class with endpoint setting support
- Updated StorageProviderSubPage to show endpoint URL input for S3-compatible
- Built pro settings bundle with rollup (Svelte 4.2.19)
- Added package.json and updated rollup.config.mjs for pro-only builds

assets/js/pro/integrations/woocommerce.js

@@ -0,0 +1,76 @@
+(function( $, _ ) {
+
+	var fileFrame;
+	var attachment;
+	var fileNameInput;
+	var fileUrlInput;
+	var fileNamePlaceholder;
+	var fileUrlPlaceholder;
+
+	/**
+	 * Render custom media uploader
+	 *
+	 * @param row Object
+	 *
+	 * @return void
+	 */
+	function renderMediaUploader( row ) {
+
+		// Find the correct file name and url inputs
+		fileNameInput = row.find( 'td.file_name input.input_text' );
+		fileUrlInput = row.find( 'td.file_url input.input_text' );
+
+		// Use existing file frame instance or create one
+		if ( undefined !== fileFrame ) {
+			fileFrame.open();
+			return;
+		}
+
+		fileFrame = wp.media.frames.file_frame = wp.media( {
+			title: as3cf_woo.strings.media_modal_title,
+			button: {
+				text: as3cf_woo.strings.media_modal_button
+			},
+			states: [
+				new wp.media.controller.Library( {
+					title: as3cf_woo.strings.media_modal_title,
+					filterable: 'all',
+					multiple: false
+				} )
+			]
+		} );
+
+		// Handle file selection
+		fileFrame.on( 'select', function() {
+			attachment = fileFrame.state().get( 'selection' ).first().toJSON();
+
+			fileNamePlaceholder = fileNameInput.attr( 'placeholder' );
+			fileUrlPlaceholder = fileUrlInput.attr( 'placeholder' );
+			fileNameInput.val( attachment.title ).attr( 'placeholder', fileNamePlaceholder ).trigger( 'change' );
+			fileUrlInput.val( attachment.url ).attr( 'placeholder', fileUrlPlaceholder ).trigger( 'change' );
+		} );
+
+		// Ensure files are uploaded to the woocommerce_uploads directory
+		fileFrame.on( 'ready', function() {
+			fileFrame.uploader.options.uploader.params = {
+				type: 'downloadable_product'
+			};
+		} );
+
+		fileFrame.open();
+	}
+
+	// Replace WooCommerce upload file click handler
+	$( document ).ready( function() {
+		$( document ).off( 'click', '.upload_file_button' );
+		$( document.body ).off( 'click', '.upload_file_button' ); // WooCommerce 2.4+
+
+		$( document ).on( 'click', '.upload_file_button', function( e ) {
+			var row = $( this ).closest( 'tr' );
+
+			e.preventDefault();
+			renderMediaUploader( row );
+		} );
+	} );
+
+})( jQuery, _ );