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/upgrades/upgrade-edd-replace-urls.php

@@ -0,0 +1,103 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Upgrades;
+
+use AS3CF_Utils;
+use DeliciousBrains\WP_Offload_Media\Items\Media_Library_Item;
+
+/**
+ * Upgrade_EDD_Replace_URLs Class
+ *
+ * This class handles replacing all S3 URLs in EDD
+ * downloads with the local URL.
+ *
+ * @since 1.2
+ */
+class Upgrade_EDD_Replace_URLs extends Upgrade {
+
+	/**
+	 * @var int
+	 */
+	protected $upgrade_id = 5;
+
+	/**
+	 * @var string
+	 */
+	protected $upgrade_name = 'replace_edd_urls';
+
+	/**
+	 * @var string 'metadata', 'attachment'
+	 */
+	protected $upgrade_type = 'post meta';
+
+	/**
+	 * Get running update text.
+	 *
+	 * @return string
+	 */
+	protected function get_running_update_text() {
+		return __( 'and ensuring that only the local URL exists in EDD post meta.', 'amazon-s3-and-cloudfront' );
+	}
+
+	/**
+	 * Get items to process.
+	 *
+	 * @param string     $prefix
+	 * @param int        $limit
+	 * @param bool|mixed $offset
+	 *
+	 * @return array
+	 */
+	protected function get_items_to_process( $prefix, $limit, $offset = false ) {
+		global $wpdb;
+
+		$sql = "SELECT * FROM `{$prefix}postmeta` WHERE meta_key = 'edd_download_files'";
+
+		if ( false !== $offset ) {
+			$sql .= " AND meta_id > {$offset->meta_id}";
+		}
+
+		if ( $limit && $limit > 0 ) {
+			$sql .= sprintf( ' LIMIT %d', (int) $limit );
+		}
+
+		return $wpdb->get_results( $sql );
+	}
+
+	/**
+	 * Upgrade item.
+	 *
+	 * @param mixed $item
+	 *
+	 * @return bool
+	 */
+	protected function upgrade_item( $item ) {
+		$attachments = AS3CF_Utils::maybe_unserialize( $item->meta_value );
+
+		if ( ! is_array( $attachments ) || empty( $attachments ) ) {
+			// No attachments to process, return
+			return false;
+		}
+
+		foreach ( $attachments as $key => $attachment ) {
+			if ( ! isset( $attachment['attachment_id'] ) || ! isset( $attachment['file'] ) ) {
+				// Can't determine ID or file, continue
+				continue;
+			}
+
+			$as3cf_item = Media_Library_Item::get_by_source_id( $attachment['attachment_id'] );
+			if ( empty( $as3cf_item ) ) {
+				continue;
+			}
+
+			if ( $url = $as3cf_item->get_local_url() ) {
+				$attachments[ $key ]['file'] = $url;
+			}
+		}
+
+		update_post_meta( $item->post_id, 'edd_download_files', $attachments );
+
+		return true;
+	}
+
+}