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/common-protos/metadata/Api/Control.php

@@ -0,0 +1,27 @@
+<?php
+
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/api/control.proto
+namespace DeliciousBrains\WP_Offload_Media\Gcp\GPBMetadata\Google\Api;
+
+class Control
+{
+    public static $is_initialized = \false;
+    public static function initOnce()
+    {
+        $pool = \DeliciousBrains\WP_Offload_Media\Gcp\Google\Protobuf\Internal\DescriptorPool::getGeneratedPool();
+        if (static::$is_initialized == \true) {
+            return;
+        }
+        \DeliciousBrains\WP_Offload_Media\Gcp\GPBMetadata\Google\Api\Policy::initOnce();
+        $pool->internalAddGeneratedFile('
+ñ

+google/api/control.proto
+google.api"Q
+Control
+environment
 
(	1
+method_policies (2.google.api.MethodPolicyBn
+com.google.apiBControlProtoP
ZEgoogle.golang.org/genproto/googleapis/api/serviceconfig;serviceconfig¢GAPIbproto3', \true);
+        static::$is_initialized = \true;
+    }
+}