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/grpc-gcp/cloudprober/codegen.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+cd "$(dirname "$0")"
+
+rm -rf google
+
+for p in $(find ../third_party/googleapis/google -type f -name *.proto); do
+	protoc \
+    --proto_path=../third_party/googleapis \
+    --php_out=./ \
+    --grpc_out=./ \
+    --plugin=protoc-gen-grpc="$(which grpc_php_plugin)" \
+    "$p"
+done