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/items/remove-provider-handler.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Pro\Items;
+
+use DeliciousBrains\WP_Offload_Media\Items\Remove_Provider_Handler as Remove_Provider_Handler_Lite;
+
+class Remove_Provider_Handler extends Remove_Provider_Handler_Lite {
+	/**
+	 * The default options that should be used if none supplied.
+	 *
+	 * @return array
+	 */
+	public static function default_options() {
+		return array(
+			'object_keys'            => array(),
+			'offloaded_files'        => array(),
+			'verify_exists_on_local' => true,
+		);
+	}
+}