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

classes/pro/tools/update-acls.php

@@ -0,0 +1,142 @@
+<?php
+
+namespace DeliciousBrains\WP_Offload_Media\Pro\Tools;
+
+use DeliciousBrains\WP_Offload_Media\Pro\Background_Processes\Background_Tool_Process;
+use DeliciousBrains\WP_Offload_Media\Pro\Background_Processes\Update_ACLs_Process;
+use DeliciousBrains\WP_Offload_Media\Pro\Background_Tool;
+
+class Update_ACLs extends Background_Tool {
+
+	/**
+	 * @var string
+	 */
+	protected $tool_key = 'update_acls';
+
+	/**
+	 * @var string
+	 */
+	protected $tab = 'media';
+
+	/**
+	 * @var array
+	 */
+	protected static $show_tool_constants = array(
+		'AS3CF_SHOW_UPDATE_ACLS_TOOL',
+	);
+
+	/**
+	 * Should render.
+	 *
+	 * @return bool
+	 */
+	public function should_render() {
+		if ( ! $this->as3cf->is_pro_plugin_setup() ) {
+			return false;
+		}
+
+		if ( false !== static::show_tool_constant() && constant( static::show_tool_constant() ) ) {
+			return true;
+		}
+
+		return $this->is_active();
+	}
+
+	/**
+	 * Get title text.
+	 *
+	 * @return string
+	 */
+	public function get_title_text() {
+		return __( 'Update Object ACLs', 'amazon-s3-and-cloudfront' );
+	}
+
+	/**
+	 * Get button text.
+	 *
+	 * @return string
+	 */
+	public function get_button_text() {
+		return __( 'Begin Update', 'amazon-s3-and-cloudfront' );
+	}
+
+	/**
+	 * Get queued status text.
+	 *
+	 * @return string
+	 */
+	public function get_queued_status(): string {
+		return __( 'Updating object ACLs in bucket.', 'amazon-s3-and-cloudfront' );
+	}
+
+	/**
+	 * Get short queued status text.
+	 *
+	 * @return string
+	 */
+	public function get_short_queued_status(): string {
+		return _x( 'Updating ACLs…', 'Short tool running message', 'amazon-s3-and-cloudfront' );
+	}
+
+	/**
+	 * Get more info text.
+	 *
+	 * @return string
+	 */
+	public static function get_more_info_text() {
+		return __( 'After disabling Block All Public Access for a bucket, you many need to update all the objects in the bucket to apply appropriate public and private ACLs so that they can be used correctly.', 'amazon-s3-and-cloudfront' );
+	}
+
+	/**
+	 * Get prompt text for when tool could be run in response to settings change.
+	 *
+	 * @return string
+	 */
+	public static function get_prompt_text() {
+		global $as3cf;
+
+		$mesg = __( 'It looks like your configuration has changed to require public and private ACLs on objects, would you like to update the ACLs on your objects?', 'amazon-s3-and-cloudfront' );
+		$mesg .= ' ';
+		$mesg .= $as3cf::more_info_link(
+			'/wp-offload-media/doc/block-all-public-access-to-bucket/',
+			'update+acls',
+			'disable-block-access'
+		);
+
+		return $mesg;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	public function get_doc_url() {
+		global $as3cf;
+
+		$args = array( 'utm_campaign' => 'update+acls' );
+
+		return $as3cf::dbrains_url( '/wp-offload-media/doc/block-all-public-access-to-bucket/', $args, 'disable-block-access' );
+	}
+
+	/**
+	 * Message for error notice.
+	 *
+	 * @param string|null $message Optional message to override the default for the tool.
+	 *
+	 * @return string
+	 */
+	protected function get_error_notice_message( $message = null ) {
+		$title   = __( 'Update ACLs Errors', 'amazon-s3-and-cloudfront' );
+		$message = empty( $message ) ? __( 'Previous attempts at updating object ACLs have resulted in errors.', 'amazon-s3-and-cloudfront' ) : $message;
+
+		return sprintf( '<strong>%1$s</strong> &mdash; %2$s', $title, $message );
+	}
+
+	/**
+	 * Get background process class.
+	 *
+	 * @return Background_Tool_Process|null
+	 */
+	protected function get_background_process_class() {
+		return new Update_ACLs_Process( $this->as3cf, $this );
+	}
+}