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/ErrorParser/AbstractErrorParser.php

@@ -0,0 +1,70 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\ErrorParser;
+
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Parser\MetadataParserTrait;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Parser\PayloadParserTrait;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Service;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\StructureShape;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\CommandInterface;
+use DeliciousBrains\WP_Offload_Media\Aws3\Psr\Http\Message\ResponseInterface;
+abstract class AbstractErrorParser
+{
+    use MetadataParserTrait;
+    use PayloadParserTrait;
+    /**
+     * @var Service
+     */
+    protected $api;
+    /**
+     * @param Service $api
+     */
+    public function __construct(Service $api = null)
+    {
+        $this->api = $api;
+    }
+    protected abstract function payload(ResponseInterface $response, StructureShape $member);
+    protected function extractPayload(StructureShape $member, ResponseInterface $response)
+    {
+        if ($member instanceof StructureShape) {
+            // Structure members parse top-level data into a specific key.
+            return $this->payload($response, $member);
+        } else {
+            // Streaming data is just the stream from the response body.
+            return $response->getBody();
+        }
+    }
+    protected function populateShape(array &$data, ResponseInterface $response, CommandInterface $command = null)
+    {
+        $data['body'] = [];
+        if (!empty($command) && !empty($this->api)) {
+            // If modeled error code is indicated, check for known error shape
+            if (!empty($data['code'])) {
+                $errors = $this->api->getOperation($command->getName())->getErrors();
+                foreach ($errors as $key => $error) {
+                    // If error code matches a known error shape, populate the body
+                    if ($data['code'] == $error['name'] && $error instanceof StructureShape) {
+                        $modeledError = $error;
+                        $data['body'] = $this->extractPayload($modeledError, $response);
+                        $data['error_shape'] = $modeledError;
+                        foreach ($error->getMembers() as $name => $member) {
+                            switch ($member['location']) {
+                                case 'header':
+                                    $this->extractHeader($name, $member, $response, $data['body']);
+                                    break;
+                                case 'headers':
+                                    $this->extractHeaders($name, $member, $response, $data['body']);
+                                    break;
+                                case 'statusCode':
+                                    $this->extractStatus($name, $response, $data['body']);
+                                    break;
+                            }
+                        }
+                        break;
+                    }
+                }
+            }
+        }
+        return $data;
+    }
+}

vendor/Aws3/Aws/Api/ErrorParser/JsonParserTrait.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\ErrorParser;
+
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Parser\PayloadParserTrait;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\StructureShape;
+use DeliciousBrains\WP_Offload_Media\Aws3\Psr\Http\Message\ResponseInterface;
+/**
+ * Provides basic JSON error parsing functionality.
+ */
+trait JsonParserTrait
+{
+    use PayloadParserTrait;
+    private function genericHandler(ResponseInterface $response)
+    {
+        $code = (string) $response->getStatusCode();
+        if ($this->api && !\is_null($this->api->getMetadata('awsQueryCompatible')) && $response->getHeaderLine('x-amzn-query-error')) {
+            $queryError = $response->getHeaderLine('x-amzn-query-error');
+            $parts = \explode(';', $queryError);
+            if (isset($parts) && \count($parts) == 2 && $parts[0] && $parts[1]) {
+                $error_code = $parts[0];
+                $error_type = $parts[1];
+            }
+        }
+        if (!isset($error_type)) {
+            $error_type = $code[0] == '4' ? 'client' : 'server';
+        }
+        return ['request_id' => (string) $response->getHeaderLine('x-amzn-requestid'), 'code' => isset($error_code) ? $error_code : null, 'message' => null, 'type' => $error_type, 'parsed' => $this->parseJson($response->getBody(), $response)];
+    }
+    protected function payload(ResponseInterface $response, StructureShape $member)
+    {
+        $jsonBody = $this->parseJson($response->getBody(), $response);
+        if ($jsonBody) {
+            return $this->parser->parse($member, $jsonBody);
+        }
+    }
+}

vendor/Aws3/Aws/Api/ErrorParser/JsonRpcErrorParser.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\ErrorParser;
+
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Parser\JsonParser;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Service;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\CommandInterface;
+use DeliciousBrains\WP_Offload_Media\Aws3\Psr\Http\Message\ResponseInterface;
+/**
+ * Parsers JSON-RPC errors.
+ */
+class JsonRpcErrorParser extends AbstractErrorParser
+{
+    use JsonParserTrait;
+    private $parser;
+    public function __construct(Service $api = null, JsonParser $parser = null)
+    {
+        parent::__construct($api);
+        $this->parser = $parser ?: new JsonParser();
+    }
+    public function __invoke(ResponseInterface $response, CommandInterface $command = null)
+    {
+        $data = $this->genericHandler($response);
+        // Make the casing consistent across services.
+        if ($data['parsed']) {
+            $data['parsed'] = \array_change_key_case($data['parsed']);
+        }
+        if (isset($data['parsed']['__type'])) {
+            if (!isset($data['code'])) {
+                $parts = \explode('#', $data['parsed']['__type']);
+                $data['code'] = isset($parts[1]) ? $parts[1] : $parts[0];
+            }
+            $data['message'] = isset($data['parsed']['message']) ? $data['parsed']['message'] : null;
+        }
+        $this->populateShape($data, $response, $command);
+        return $data;
+    }
+}

vendor/Aws3/Aws/Api/ErrorParser/RestJsonErrorParser.php

@@ -0,0 +1,43 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\ErrorParser;
+
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Parser\JsonParser;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Service;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\StructureShape;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\CommandInterface;
+use DeliciousBrains\WP_Offload_Media\Aws3\Psr\Http\Message\ResponseInterface;
+/**
+ * Parses JSON-REST errors.
+ */
+class RestJsonErrorParser extends AbstractErrorParser
+{
+    use JsonParserTrait;
+    private $parser;
+    public function __construct(Service $api = null, JsonParser $parser = null)
+    {
+        parent::__construct($api);
+        $this->parser = $parser ?: new JsonParser();
+    }
+    public function __invoke(ResponseInterface $response, CommandInterface $command = null)
+    {
+        $data = $this->genericHandler($response);
+        // Merge in error data from the JSON body
+        if ($json = $data['parsed']) {
+            $data = \array_replace($data, $json);
+        }
+        // Correct error type from services like Amazon Glacier
+        if (!empty($data['type'])) {
+            $data['type'] = \strtolower($data['type']);
+        }
+        // Retrieve the error code from services like Amazon Elastic Transcoder
+        if ($code = $response->getHeaderLine('x-amzn-errortype')) {
+            $colon = \strpos($code, ':');
+            $data['code'] = $colon ? \substr($code, 0, $colon) : $code;
+        }
+        // Retrieve error message directly
+        $data['message'] = isset($data['parsed']['message']) ? $data['parsed']['message'] : (isset($data['parsed']['Message']) ? $data['parsed']['Message'] : null);
+        $this->populateShape($data, $response, $command);
+        return $data;
+    }
+}

vendor/Aws3/Aws/Api/ErrorParser/XmlErrorParser.php

@@ -0,0 +1,82 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\ErrorParser;
+
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Parser\PayloadParserTrait;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Parser\XmlParser;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Service;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\StructureShape;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\CommandInterface;
+use DeliciousBrains\WP_Offload_Media\Aws3\Psr\Http\Message\ResponseInterface;
+/**
+ * Parses XML errors.
+ */
+class XmlErrorParser extends AbstractErrorParser
+{
+    use PayloadParserTrait;
+    protected $parser;
+    public function __construct(Service $api = null, XmlParser $parser = null)
+    {
+        parent::__construct($api);
+        $this->parser = $parser ?: new XmlParser();
+    }
+    public function __invoke(ResponseInterface $response, CommandInterface $command = null)
+    {
+        $code = (string) $response->getStatusCode();
+        $data = ['type' => $code[0] == '4' ? 'client' : 'server', 'request_id' => null, 'code' => null, 'message' => null, 'parsed' => null];
+        $body = $response->getBody();
+        if ($body->getSize() > 0) {
+            $this->parseBody($this->parseXml($body, $response), $data);
+        } else {
+            $this->parseHeaders($response, $data);
+        }
+        $this->populateShape($data, $response, $command);
+        return $data;
+    }
+    private function parseHeaders(ResponseInterface $response, array &$data)
+    {
+        if ($response->getStatusCode() == '404') {
+            $data['code'] = 'NotFound';
+        }
+        $data['message'] = $response->getStatusCode() . ' ' . $response->getReasonPhrase();
+        if ($requestId = $response->getHeaderLine('x-amz-request-id')) {
+            $data['request_id'] = $requestId;
+            $data['message'] .= " (Request-ID: {$requestId})";
+        }
+    }
+    private function parseBody(\SimpleXMLElement $body, array &$data)
+    {
+        $data['parsed'] = $body;
+        $prefix = $this->registerNamespacePrefix($body);
+        if ($tempXml = $body->xpath("//{$prefix}Code[1]")) {
+            $data['code'] = (string) $tempXml[0];
+        }
+        if ($tempXml = $body->xpath("//{$prefix}Message[1]")) {
+            $data['message'] = (string) $tempXml[0];
+        }
+        $tempXml = $body->xpath("//{$prefix}RequestId[1]");
+        if (isset($tempXml[0])) {
+            $data['request_id'] = (string) $tempXml[0];
+        }
+    }
+    protected function registerNamespacePrefix(\SimpleXMLElement $element)
+    {
+        $namespaces = $element->getDocNamespaces();
+        if (!isset($namespaces[''])) {
+            return '';
+        }
+        // Account for the default namespace being defined and PHP not
+        // being able to handle it :(.
+        $element->registerXPathNamespace('ns', $namespaces['']);
+        return 'ns:';
+    }
+    protected function payload(ResponseInterface $response, StructureShape $member)
+    {
+        $xmlBody = $this->parseXml($response->getBody(), $response);
+        $prefix = $this->registerNamespacePrefix($xmlBody);
+        $errorBody = $xmlBody->xpath("//{$prefix}Error");
+        if (\is_array($errorBody) && !empty($errorBody[0])) {
+            return $this->parser->parse($member, $errorBody[0]);
+        }
+    }
+}