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/Api/DocModel.php

@@ -0,0 +1,107 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api;
+
+/**
+ * Encapsulates the documentation strings for a given service-version and
+ * provides methods for extracting the desired parts related to a service,
+ * operation, error, or shape (i.e., parameter).
+ */
+class DocModel
+{
+    /** @var array */
+    private $docs;
+    /**
+     * @param array $docs
+     *
+     * @throws \RuntimeException
+     */
+    public function __construct(array $docs)
+    {
+        if (!\extension_loaded('tidy')) {
+            throw new \RuntimeException('The "tidy" PHP extension is required.');
+        }
+        $this->docs = $docs;
+    }
+    /**
+     * Convert the doc model to an array.
+     *
+     * @return array
+     */
+    public function toArray()
+    {
+        return $this->docs;
+    }
+    /**
+     * Retrieves documentation about the service.
+     *
+     * @return null|string
+     */
+    public function getServiceDocs()
+    {
+        return isset($this->docs['service']) ? $this->docs['service'] : null;
+    }
+    /**
+     * Retrieves documentation about an operation.
+     *
+     * @param string $operation Name of the operation
+     *
+     * @return null|string
+     */
+    public function getOperationDocs($operation)
+    {
+        return isset($this->docs['operations'][$operation]) ? $this->docs['operations'][$operation] : null;
+    }
+    /**
+     * Retrieves documentation about an error.
+     *
+     * @param string $error Name of the error
+     *
+     * @return null|string
+     */
+    public function getErrorDocs($error)
+    {
+        return isset($this->docs['shapes'][$error]['base']) ? $this->docs['shapes'][$error]['base'] : null;
+    }
+    /**
+     * Retrieves documentation about a shape, specific to the context.
+     *
+     * @param string $shapeName  Name of the shape.
+     * @param string $parentName Name of the parent/context shape.
+     * @param string $ref        Name used by the context to reference the shape.
+     *
+     * @return null|string
+     */
+    public function getShapeDocs($shapeName, $parentName, $ref)
+    {
+        if (!isset($this->docs['shapes'][$shapeName])) {
+            return '';
+        }
+        $result = '';
+        $d = $this->docs['shapes'][$shapeName];
+        if (isset($d['refs']["{$parentName}\${$ref}"])) {
+            $result = $d['refs']["{$parentName}\${$ref}"];
+        } elseif (isset($d['base'])) {
+            $result = $d['base'];
+        }
+        if (isset($d['append'])) {
+            if (!isset($d['excludeAppend']) || !\in_array($parentName, $d['excludeAppend'])) {
+                $result .= $d['append'];
+            }
+        }
+        if (isset($d['appendOnly']) && \in_array($parentName, $d['appendOnly']['shapes'])) {
+            $result .= $d['appendOnly']['message'];
+        }
+        return $this->clean($result);
+    }
+    private function clean($content)
+    {
+        if (!$content) {
+            return '';
+        }
+        $tidy = new \tidy();
+        $tidy->parseString($content, ['indent' => \true, 'doctype' => 'omit', 'output-html' => \true, 'show-body-only' => \true, 'drop-empty-paras' => \true, 'clean' => \true, 'drop-proprietary-attributes' => \true, 'hide-comments' => \true, 'logical-emphasis' => \true]);
+        $tidy->cleanRepair();
+        return (string) $content;
+    }
+}