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/guzzlehttp/promises/CHANGELOG.md

@@ -0,0 +1,166 @@
+# CHANGELOG
+
+
+## 2.0.4 - 2024-10-17
+
+### Fixed
+
+- Once settled, don't allow further rejection of additional promises
+
+
+## 2.0.3 - 2024-07-18
+
+### Changed
+
+- PHP 8.4 support
+
+
+## 2.0.2 - 2023-12-03
+
+### Changed
+
+- Replaced `call_user_func*` with native calls
+
+
+## 2.0.1 - 2023-08-03
+
+### Changed
+
+- PHP 8.3 support
+
+
+## 2.0.0 - 2023-05-21
+
+### Added
+
+- Added PHP 7 type hints
+
+### Changed
+
+- All previously non-final non-exception classes have been marked as soft-final
+
+### Removed
+
+- Dropped PHP < 7.2 support
+- All functions in the `GuzzleHttp\Promise` namespace
+
+
+## 1.5.3 - 2023-05-21
+
+### Changed
+
+- Removed remaining usage of deprecated functions
+
+
+## 1.5.2 - 2022-08-07
+
+### Changed
+
+- Officially support PHP 8.2
+
+
+## 1.5.1 - 2021-10-22
+
+### Fixed
+
+- Revert "Call handler when waiting on fulfilled/rejected Promise"
+- Fix pool memory leak when empty array of promises provided
+
+
+## 1.5.0 - 2021-10-07
+
+### Changed
+
+- Call handler when waiting on fulfilled/rejected Promise
+- Officially support PHP 8.1
+
+### Fixed
+
+- Fix manually settle promises generated with `Utils::task`
+
+
+## 1.4.1 - 2021-02-18
+
+### Fixed
+
+- Fixed `each_limit` skipping promises and failing
+
+
+## 1.4.0 - 2020-09-30
+
+### Added
+
+- Support for PHP 8
+- Optional `$recursive` flag to `all`
+- Replaced functions by static methods
+
+### Fixed
+
+- Fix empty `each` processing
+- Fix promise handling for Iterators of non-unique keys
+- Fixed `method_exists` crashes on PHP 8
+- Memory leak on exceptions
+
+
+## 1.3.1 - 2016-12-20
+
+### Fixed
+
+- `wait()` foreign promise compatibility
+
+
+## 1.3.0 - 2016-11-18
+
+### Added
+
+- Adds support for custom task queues.
+
+### Fixed
+
+- Fixed coroutine promise memory leak.
+
+
+## 1.2.0 - 2016-05-18
+
+### Changed
+
+- Update to now catch `\Throwable` on PHP 7+
+
+
+## 1.1.0 - 2016-03-07
+
+### Changed
+
+- Update EachPromise to prevent recurring on a iterator when advancing, as this
+  could trigger fatal generator errors.
+- Update Promise to allow recursive waiting without unwrapping exceptions.
+
+
+## 1.0.3 - 2015-10-15
+
+### Changed
+
+- Update EachPromise to immediately resolve when the underlying promise iterator
+  is empty. Previously, such a promise would throw an exception when its `wait`
+  function was called.
+
+
+## 1.0.2 - 2015-05-15
+
+### Changed
+
+- Conditionally require functions.php.
+
+
+## 1.0.1 - 2015-06-24
+
+### Changed
+
+- Updating EachPromise to call next on the underlying promise iterator as late
+  as possible to ensure that generators that generate new requests based on
+  callbacks are not iterated until after callbacks are invoked.
+
+
+## 1.0.0 - 2015-05-12
+
+- Initial release