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/RulesetParameter.php

@@ -0,0 +1,119 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws\EndpointV2\Ruleset;
+
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Exception\UnresolvedEndpointException;
+/**
+ * Houses properties of an individual parameter definition.
+ */
+class RulesetParameter
+{
+    /** @var string */
+    private $name;
+    /** @var string */
+    private $type;
+    /** @var string */
+    private $builtIn;
+    /** @var string */
+    private $default;
+    /** @var array */
+    private $required;
+    /** @var string */
+    private $documentation;
+    /** @var boolean */
+    private $deprecated;
+    public function __construct($name, array $definition)
+    {
+        $type = \ucfirst($definition['type']);
+        if ($this->isValidType($type)) {
+            $this->type = $type;
+        } else {
+            throw new UnresolvedEndpointException('Unknown parameter type ' . "`{$type}`" . '. Parameters must be of type `String` or `Boolean`.');
+        }
+        $this->name = $name;
+        $this->builtIn = isset($definition['builtIn']) ? $definition['builtIn'] : null;
+        $this->default = isset($definition['default']) ? $definition['default'] : null;
+        $this->required = isset($definition['required']) ? $definition['required'] : \false;
+        $this->documentation = isset($definition['documentation']) ? $definition['documentation'] : null;
+        $this->deprecated = isset($definition['deprecated']) ? $definition['deprecated'] : \false;
+    }
+    /**
+     * @return mixed
+     */
+    public function getName()
+    {
+        return $this->name;
+    }
+    /**
+     * @return mixed
+     */
+    public function getType()
+    {
+        return $this->type;
+    }
+    /**
+     * @return mixed
+     */
+    public function getBuiltIn()
+    {
+        return $this->builtIn;
+    }
+    /**
+     * @return mixed
+     */
+    public function getDefault()
+    {
+        return $this->default;
+    }
+    /**
+     * @return boolean
+     */
+    public function getRequired()
+    {
+        return $this->required;
+    }
+    /**
+     * @return string
+     */
+    public function getDocumentation()
+    {
+        return $this->documentation;
+    }
+    /**
+     * @return boolean
+     */
+    public function getDeprecated()
+    {
+        return $this->deprecated;
+    }
+    /**
+     * Validates that an input parameter matches the type provided in its definition.
+     *
+     * @return void
+     * @throws InvalidArgumentException
+     */
+    public function validateInputParam($inputParam)
+    {
+        $typeMap = ['String' => 'is_string', 'Boolean' => 'is_bool'];
+        if ($typeMap[$this->type]($inputParam) === \false) {
+            throw new UnresolvedEndpointException("Input parameter `{$this->name}` is the wrong type. Must be a {$this->type}.");
+        }
+        if ($this->deprecated) {
+            $deprecated = $this->deprecated;
+            $deprecationString = "{$this->name} has been deprecated ";
+            $msg = isset($deprecated['message']) ? $deprecated['message'] : null;
+            $since = isset($deprecated['since']) ? $deprecated['since'] : null;
+            if (!\is_null($since)) {
+                $deprecationString = $deprecationString . 'since ' . $since . '. ';
+            }
+            if (!\is_null($msg)) {
+                $deprecationString = $deprecationString . $msg;
+            }
+            \trigger_error($deprecationString, \E_USER_WARNING);
+        }
+    }
+    private function isValidType($type)
+    {
+        return \in_array($type, ['String', 'Boolean']);
+    }
+}