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

assets/js/notice.js

@@ -0,0 +1,37 @@
+(function( $ ) {
+
+	var $body = $( 'body' );
+
+	$body.on( 'click', '.as3cf-notice .notice-dismiss', function( e ) {
+		var id = $( this ).parents( '.as3cf-notice' ).attr( 'id' );
+		if ( id ) {
+			var data = {
+				action: 'as3cf-dismiss-notice',
+				notice_id: id,
+				_nonce: as3cf_notice.nonces.dismiss_notice
+			};
+
+			$.ajax( {
+				url: ajaxurl,
+				type: 'POST',
+				dataType: 'JSON',
+				data: data,
+				error: function( jqXHR, textStatus, errorThrown ) {
+					alert( as3cf_notice.strings.dismiss_notice_error + errorThrown );
+				}
+			} );
+		}
+	} );
+
+	$body.on( 'click', '.as3cf-notice-toggle', function( e ) {
+		e.preventDefault();
+		var $link = $( this );
+		var label = $link.data( 'hide' );
+
+		$link.data( 'hide', $link.html() );
+		$link.html( label );
+
+		$link.closest( '.as3cf-notice' ).find( '.as3cf-notice-toggle-content' ).toggle();
+	} );
+
+})( jQuery );