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/Parser/JsonRpcParser.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Parser;
+
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Operation;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\StructureShape;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Api\Service;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\Result;
+use DeliciousBrains\WP_Offload_Media\Aws3\Aws\CommandInterface;
+use DeliciousBrains\WP_Offload_Media\Aws3\Psr\Http\Message\ResponseInterface;
+use DeliciousBrains\WP_Offload_Media\Aws3\Psr\Http\Message\StreamInterface;
+/**
+ * @internal Implements JSON-RPC parsing (e.g., DynamoDB)
+ */
+class JsonRpcParser extends AbstractParser
+{
+    use PayloadParserTrait;
+    /**
+     * @param Service    $api    Service description
+     * @param JsonParser $parser JSON body builder
+     */
+    public function __construct(Service $api, JsonParser $parser = null)
+    {
+        parent::__construct($api);
+        $this->parser = $parser ?: new JsonParser();
+    }
+    public function __invoke(CommandInterface $command, ResponseInterface $response)
+    {
+        $operation = $this->api->getOperation($command->getName());
+        return $this->parseResponse($response, $operation);
+    }
+    /**
+     * This method parses a response based on JSON RPC protocol.
+     *
+     * @param ResponseInterface $response the response to parse.
+     * @param Operation $operation the operation which holds information for
+     *        parsing the response.
+     *
+     * @return Result
+     */
+    private function parseResponse(ResponseInterface $response, Operation $operation)
+    {
+        if (null === $operation['output']) {
+            return new Result([]);
+        }
+        $outputShape = $operation->getOutput();
+        foreach ($outputShape->getMembers() as $memberName => $memberProps) {
+            if (!empty($memberProps['eventstream'])) {
+                return new Result([$memberName => new EventParsingIterator($response->getBody(), $outputShape->getMember($memberName), $this)]);
+            }
+        }
+        $result = $this->parseMemberFromStream($response->getBody(), $operation->getOutput(), $response);
+        return new Result(\is_null($result) ? [] : $result);
+    }
+    public function parseMemberFromStream(StreamInterface $stream, StructureShape $member, $response)
+    {
+        return $this->parser->parse($member, $this->parseJson($stream, $response));
+    }
+}