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/Gcp/google/cloud-core/bin/google-cloud-batch

@@ -0,0 +1,61 @@
+#!/usr/bin/env php
+<?php 
+/**
+ * Copyright 2017 Google Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+namespace DeliciousBrains\WP_Offload_Media\Gcp\Google\Cloud\Core\Batch;
+
+$foundAutoloader = \false;
+$autoloaderCandidates = [
+    '/../vendor/autoload.php',
+    // Git clone of google-cloud-php-core
+    '/../../vendor/autoload.php',
+    // Git clone of google-cloud-php
+    '/../../../autoload.php',
+    // google/cloud-core installation
+    '/../../../../autoload.php',
+];
+foreach ($autoloaderCandidates as $candidate) {
+    if (\file_exists(__DIR__ . $candidate)) {
+        require_once __DIR__ . $candidate;
+        $foundAutoloader = \true;
+        break;
+    }
+}
+if (!$foundAutoloader) {
+    die('No autoloader found');
+}
+function showUsageAndDie()
+{
+    die("usage: " . __FILE__ . " [daemon|retry] {id}");
+}
+if (\count($argv) < 2) {
+    showUsageAndDie();
+}
+if ($argv[1] === 'daemon') {
+    $daemon = new BatchDaemon(__FILE__);
+    if (\count($argv) == 2) {
+        $daemon->run();
+    } else {
+        $idNum = (int) $argv[2];
+        $job = $daemon->job($idNum);
+        $job->run();
+    }
+} elseif ($argv[1] === 'retry') {
+    $retry = new Retry();
+    $retry->retryAll();
+} else {
+    showUsageAndDie();
+}