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/MonitoredResource.php

@@ -0,0 +1,45 @@
+<?php
+
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: google/api/monitored_resource.proto
+namespace DeliciousBrains\WP_Offload_Media\Gcp\GPBMetadata\Google\Api;
+
+class MonitoredResource
+{
+    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\Label::initOnce();
+        \DeliciousBrains\WP_Offload_Media\Gcp\GPBMetadata\Google\Api\LaunchStage::initOnce();
+        \DeliciousBrains\WP_Offload_Media\Gcp\GPBMetadata\Google\Protobuf\Struct::initOnce();
+        $pool->internalAddGeneratedFile('
+<EFBFBD>
+#google/api/monitored_resource.proto
+google.apigoogle/api/launch_stage.protogoogle/protobuf/struct.proto"À

+MonitoredResourceDescriptor
+name 
(	
+type
 
(	
+display_name 
(	
+description 
(	+
+labels (2.google.api.LabelDescriptor-
+launch_stage 
(2.google.api.LaunchStage"‹

+MonitoredResource
+type
 
(	9
+labels (2).google.api.MonitoredResource.LabelsEntry-
+LabelsEntry
+key
 
(	
+value 
(	:8
"Ê

+MonitoredResourceMetadata.
+
+system_labels
 
(2.google.protobuf.StructJ
+user_labels (25.google.api.MonitoredResourceMetadata.UserLabelsEntry1
+UserLabelsEntry
+key
 
(	
+value 
(	:8
By
+com.google.apiBMonitoredResourceProtoP
ZCgoogle.golang.org/genproto/googleapis/api/monitoredres;monitoredresø

¢GAPIbproto3', \true);
+        static::$is_initialized = \true;
+    }