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/ramsey/collection/src/Map/MapInterface.php

@@ -0,0 +1,137 @@
+<?php
+
+/**
+ * This file is part of the ramsey/collection library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ */
+declare (strict_types=1);
+namespace DeliciousBrains\WP_Offload_Media\Gcp\Ramsey\Collection\Map;
+
+use DeliciousBrains\WP_Offload_Media\Gcp\Ramsey\Collection\ArrayInterface;
+/**
+ * An object that maps keys to values.
+ *
+ * A map cannot contain duplicate keys; each key can map to at most one value.
+ *
+ * @template T
+ * @extends ArrayInterface<T>
+ */
+interface MapInterface extends ArrayInterface
+{
+    /**
+     * Returns `true` if this map contains a mapping for the specified key.
+     *
+     * @param array-key $key The key to check in the map.
+     */
+    public function containsKey($key) : bool;
+    /**
+     * Returns `true` if this map maps one or more keys to the specified value.
+     *
+     * This performs a strict type check on the value.
+     *
+     * @param T $value The value to check in the map.
+     */
+    // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+    public function containsValue($value) : bool;
+    /**
+     * Return an array of the keys contained in this map.
+     *
+     * @return list<array-key>
+     */
+    public function keys() : array;
+    /**
+     * Returns the value to which the specified key is mapped, `null` if this
+     * map contains no mapping for the key, or (optionally) `$defaultValue` if
+     * this map contains no mapping for the key.
+     *
+     * @param array-key $key The key to return from the map.
+     * @param T|null $defaultValue The default value to use if `$key` is not found.
+     *
+     * @return T|null the value or `null` if the key could not be found.
+     */
+    // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+    public function get($key, $defaultValue = null);
+    /**
+     * Associates the specified value with the specified key in this map.
+     *
+     * If the map previously contained a mapping for the key, the old value is
+     * replaced by the specified value.
+     *
+     * @param array-key $key The key to put or replace in the map.
+     * @param T $value The value to store at `$key`.
+     *
+     * @return T|null the previous value associated with key, or `null` if
+     *     there was no mapping for `$key`.
+     */
+    // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+    public function put($key, $value);
+    /**
+     * Associates the specified value with the specified key in this map only if
+     * it is not already set.
+     *
+     * If there is already a value associated with `$key`, this returns that
+     * value without replacing it.
+     *
+     * @param array-key $key The key to put in the map.
+     * @param T $value The value to store at `$key`.
+     *
+     * @return T|null the previous value associated with key, or `null` if
+     *     there was no mapping for `$key`.
+     */
+    // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+    public function putIfAbsent($key, $value);
+    /**
+     * Removes the mapping for a key from this map if it is present.
+     *
+     * @param array-key $key The key to remove from the map.
+     *
+     * @return T|null the previous value associated with key, or `null` if
+     *     there was no mapping for `$key`.
+     */
+    // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+    public function remove($key);
+    /**
+     * Removes the entry for the specified key only if it is currently mapped to
+     * the specified value.
+     *
+     * This performs a strict type check on the value.
+     *
+     * @param array-key $key The key to remove from the map.
+     * @param T $value The value to match.
+     *
+     * @return bool true if the value was removed.
+     */
+    // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+    public function removeIf($key, $value) : bool;
+    /**
+     * Replaces the entry for the specified key only if it is currently mapped
+     * to some value.
+     *
+     * @param array-key $key The key to replace.
+     * @param T $value The value to set at `$key`.
+     *
+     * @return T|null the previous value associated with key, or `null` if
+     *     there was no mapping for `$key`.
+     */
+    // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+    public function replace($key, $value);
+    /**
+     * Replaces the entry for the specified key only if currently mapped to the
+     * specified value.
+     *
+     * This performs a strict type check on the value.
+     *
+     * @param array-key $key The key to remove from the map.
+     * @param T $oldValue The value to match.
+     * @param T $newValue The value to use as a replacement.
+     *
+     * @return bool true if the value was replaced.
+     */
+    // phpcs:ignore SlevomatCodingStandard.TypeHints.ParameterTypeHint.MissingNativeTypeHint
+    public function replaceIf($key, $oldValue, $newValue) : bool;
+}