feat(icons): split built-in sprite into per-icon SVG sources and add ticket icon

Move the 114 built-in sprite icons out of assets/js/runtime/svg-icon.js into
assets/icons/sprite/{key}.svg and generate svg-icon.js with
tools/build-svg-sprite.mjs. Add ticket-color and use it for the user center
ticket entry. Update sidebar contract tests for the creator card labels.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

inc/helpers/user-center-renderers/sidebar-nav.php

@@ -41,7 +41,7 @@ $services = array_values(array_filter([
 	],
 	[
 		'label' => __('工单中心', 'aksrt'),
-		'icon'  => 'manual-service',
+		'icon'  => 'ticket-color',
 		'url'   => $tickets_url,
 		'tab'   => 'tickets',
 	],