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/tools/downloader-deactivate-plugin.js

@@ -0,0 +1,77 @@
+var as3cfDeactivatePluginModal = (function( $, as3cfModal ) {
+
+	var modal = {
+		selector: '.as3cf-deactivate-plugin-container',
+		event: {}
+	};
+
+	var wpApiSettings = window.wpApiSettings;
+
+	/**
+	 * Open modal
+	 *
+	 * @param {object} event
+	 */
+	modal.open = function( event ) {
+		modal.event = event;
+		modal.event.preventDefault();
+
+		as3cfModal.open( modal.selector, null, 'deactivate-plugin' );
+	};
+
+	/**
+	 * Close modal
+	 */
+	modal.close = function( download ) {
+		as3cfModal.setLoadingState( false );
+		as3cfModal.close();
+
+		if ( 1 === parseInt( download ) ) {
+			// Start tool and let it redirect to Tools page.
+			modal.startTool();
+		} else {
+			// Just let page do its thing.
+			window.location = modal.event.target;
+		}
+	};
+
+	modal.startTool = function() {
+		$.ajax( {
+			url: wpApiSettings.root + 'wp-offload-media/v1/tool/',
+			method: 'POST',
+			beforeSend: function( xhr ) {
+				xhr.setRequestHeader( 'Accept', 'application/json' );
+				xhr.setRequestHeader( 'Content-Type', 'application/json' );
+				xhr.setRequestHeader( 'X-WP-Nonce', wpApiSettings.nonce );
+			},
+			data: JSON.stringify( {
+				'id': 'downloader',
+				'action': 'start'
+			} )
+		} ).done( function( response ) {
+			window.location = as3cfpro_downloader.plugin_url;
+		} );
+	};
+
+	// Setup click handlers
+	$( document ).ready( function() {
+
+		$( 'body' ).on( 'click', '.deactivate-plugin [data-download-tool]', function( e ) {
+			var value = $( this ).data( 'download-tool' );
+
+			$( '[data-download-tool]' ).prop( 'disabled', true ).siblings( '.spinner' ).css( 'visibility', 'visible' ).show();
+
+			as3cfModal.setLoadingState( true );
+
+			modal.close( value );
+		} );
+
+		$( 'body' ).on( 'click', '#' + as3cfpro_downloader.plugin_slug + ' .deactivate a, [data-slug="' + as3cfpro_downloader.plugin_slug + '"]  .deactivate a', function( event ) {
+			as3cfDeactivatePluginModal.open( event );
+		} );
+
+	} );
+
+	return modal;
+
+})( jQuery, as3cfModal );