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

vendor/Gcp/ramsey/uuid/src/Builder/UuidBuilderInterface.php

@@ -0,0 +1,36 @@
+<?php
+
+/**
+ * This file is part of the ramsey/uuid library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ */
+declare (strict_types=1);
+namespace DeliciousBrains\WP_Offload_Media\Gcp\Ramsey\Uuid\Builder;
+
+use DeliciousBrains\WP_Offload_Media\Gcp\Ramsey\Uuid\Codec\CodecInterface;
+use DeliciousBrains\WP_Offload_Media\Gcp\Ramsey\Uuid\UuidInterface;
+/**
+ * A UUID builder builds instances of UuidInterface
+ *
+ * @psalm-immutable
+ */
+interface UuidBuilderInterface
+{
+    /**
+     * Builds and returns a UuidInterface
+     *
+     * @param CodecInterface $codec The codec to use for building this UuidInterface instance
+     * @param string $bytes The byte string from which to construct a UUID
+     *
+     * @return UuidInterface Implementations may choose to return more specific
+     *     instances of UUIDs that implement UuidInterface
+     *
+     * @psalm-pure
+     */
+    public function build(CodecInterface $codec, string $bytes) : UuidInterface;
+}