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/Aws3/Aws/EndpointV2/Ruleset/RulesetEndpoint.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws\EndpointV2\Ruleset;
+
+/**
+ * Represents a fully resolved endpoint that a
+ * rule returns if input parameters meet its requirements.
+ */
+class RulesetEndpoint
+{
+    /** @var string */
+    private $url;
+    /** @var array */
+    private $properties;
+    /** @var array */
+    private $headers;
+    public function __construct($url, $properties = null, $headers = null)
+    {
+        $this->url = $url;
+        $this->properties = $properties;
+        $this->headers = $headers;
+    }
+    /**
+     * @return mixed
+     */
+    public function getUrl()
+    {
+        return $this->url;
+    }
+    /**
+     * @param $property
+     * @return mixed
+     */
+    public function getProperty($property)
+    {
+        if (isset($this->properties[$property])) {
+            return $this->properties[$property];
+        }
+        return null;
+    }
+    /**
+     * @return mixed
+     */
+    public function getProperties()
+    {
+        return $this->properties;
+    }
+    /**
+     * @return mixed
+     */
+    public function getHeaders()
+    {
+        return $this->headers;
+    }
+}