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

classes/pro/as3cf-pro-utils.php

@@ -0,0 +1,96 @@
+<?php
+/**
+ * Pro Plugin Utilities
+ *
+ * @package     amazon-s3-and-cloudfront-pro
+ * @subpackage  Classes/Utils
+ * @copyright   Copyright (c) 2015, Delicious Brains
+ * @license     http://opensource.org/licenses/gpl-2.0.php GNU Public License
+ * @since       1.0
+ */
+
+// Exit if accessed directly
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ * AS3CF_Pro_Utils Class
+ *
+ * This class contains utility functions that need to be available
+ * across the Pro plugin codebase
+ *
+ * @since 1.0
+ */
+class AS3CF_Pro_Utils {
+
+	/**
+	 * Delete wildcard options
+	 *
+	 * @param array|string $keys
+	 */
+	public static function delete_wildcard_options( $keys ) {
+		global $wpdb;
+
+		$table  = $wpdb->options;
+		$column = 'option_name';
+
+		if ( is_multisite() ) {
+			$table  = $wpdb->sitemeta;
+			$column = 'meta_key';
+		}
+
+		// Convert string values to array
+		if ( ! is_array( $keys ) ) {
+			$keys = array( $keys );
+		}
+
+		foreach ( $keys as $key ) {
+			$wpdb->query( $wpdb->prepare( "
+				DELETE FROM {$table}
+				WHERE {$column} LIKE %s
+			", $key ) );
+		}
+	}
+
+	/**
+	 * Get all the keys of background jobs that could be running
+	 *
+	 * @return array
+	 */
+	public static function get_batch_job_keys() {
+		$keys = array(
+			'as3cf_find_replace_batch_%',
+			'as3cf_legacy_upload_%',
+			'as3cf_media_actions_batch_%',
+			'as3cf_settings_change_batch_%',
+			'as3cf_minify_batch_%',
+			'as3cf_process_assets_batch_%',
+		);
+
+		return $keys;
+	}
+
+	/**
+	 * Recursively collapses an empty array structure.
+	 *
+	 * @param mixed $array
+	 *
+	 * @return mixed
+	 */
+	public static function array_prune_recursive( $array ) {
+		if ( ! is_array( $array ) ) {
+			return $array;
+		}
+
+		foreach ( $array as $key => &$value ) {
+			$value = self::array_prune_recursive( $value );
+
+			if ( empty( $value ) && ! is_numeric( $value ) ) {
+				unset( $array[ $key ] );
+			}
+		}
+
+		return $array;
+	}
+}