chore(branding): remove leftover upstream theme identifiers

The theme was renamed Zibll/子比 → AKSRT → Jio, but upstream branding
survived the sweeps in CSS classes, the SVG sprite prefix, a persisted
widget field ID, JS events, admin Vue class names, test infrastructure
and docblocks.

Renames:
- zib-widget / zib-widget-wrap / zib-slider → jio-widget-box /
  jio-widget-box-wrap / jio-slider-box (jio-widget is taken by the modern
  widget shell, jio-box-* by the card primitives)
- zib-partners-scroll + zps-* → jio-partners-scroll + jps-*
- zib-combo-info-card + zci-* → jio-combo-info-card + jci-*
- zibsvg- → jiosvg-, including the exported picker helpers and the
  fa-zibsvg- family-prefix guard
- zibpay_type → pay_type; the dual-read fallback in PostQuery collapses
  to a single key
- [zibajax="submit"] dropped (no PHP emitter); zib_ajax.success →
  jio_ajax.success
- aks-* admin Vue classes → jio-*
- zib_palette() → palette()

User-facing vendor traces are gone: the floating "more" button default no
longer ships a zibll.com link or 子比主题 marketing copy, the notice
widget ships no preset promo entries, and the four 官网教程 links are
removed from the post-list admin schema.

Test infrastructure renamed to neutral names (docker-compose.reference.yml,
Caddyfile, article-baseline.json, modern-widgets-contract.test.cjs) with
their DB/volume/env/slug identifiers following.

Kept intentionally, documented in tests/fixtures/README.md: the golden
fixture reference fingerprint (a SHA-256 record of an external directory,
read by validate-widget-golden / generate-widget-golden-fixture /
audit-widget-system), the doesNotMatch guards that prove the old tokens are
gone, and the reference theme's own meta key in the visual fixtures.

No backward-compat or data migration: saved widget configs holding old
icon keys or the old field ID silently lose them, per the project's
rewrite-over-compatibility rule.

Verified: 132/132 node contract tests, php tests/widget-system/run.php
(146 assertions), audit-admin-contracts, audit-psr4-paths and
validate-widget-golden all green; tracked bundles regenerated and in sync.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

inc/helpers/jio-homepage.php

@@ -114,7 +114,7 @@ if (!function_exists('jio_homepage_get_sort_mode')) {
 
 if (!function_exists('jio_homepage_get_request_sort')) {
 	/**
-	 * Main-stream sort requested by URL (?orderby=), legacy zib_sift_posts_per_orde.
+	 * Main-stream sort requested by URL (?orderby=).
 	 *
 	 * 排序菜单（.ajax-option）点击后原位刷新的响应页靠它同序。
 	 */
@@ -218,7 +218,7 @@ if (!function_exists('jio_homepage_apply_named_sort_args')) {
 
 if (!function_exists('jio_homepage_render_ajax_option_menu')) {
 	/**
-	 * 首页排序菜单，1:1 zib_ajax_option_menu('home')。
+	 * 首页排序菜单。
 	 *
 	 * 输出 .ajax-option.ajax-replace[win-ajax-replace="filter"]，点击 .ajax-next
 	 * 排序链接由 runtime post_ajax 原位替换 #index-tab-main 内的列表。
@@ -248,7 +248,7 @@ if (!function_exists('jio_homepage_render_ajax_option_menu')) {
 
 if (!function_exists('jio_homepage_get_option_orderby_but')) {
 	/**
-	 * 排序方式按钮组，1:1 zib_get_option_orderby_but。
+	 * 排序方式按钮组。
 	 *
 	 * @param array{lists?:string[],dropdown?:bool} $option Sort option config.
 	 */
@@ -316,7 +316,7 @@ if (!function_exists('jio_homepage_get_option_orderby_but')) {
 
 if (!function_exists('jio_homepage_get_current_url')) {
 	/**
-	 * 当前页面链接，1:1 zib_get_current_url。
+	 * 当前页面链接。
 	 */
 	function jio_homepage_get_current_url(): string {
 		$home_url = home_url();
@@ -328,7 +328,7 @@ if (!function_exists('jio_homepage_get_current_url')) {
 
 if (!function_exists('jio_homepage_url_del_paged')) {
 	/**
-	 * 移除分页参数的链接，1:1 zib_url_del_paged。
+	 * 移除分页参数的链接。
 	 */
 	function jio_homepage_url_del_paged(string $url): string {
 		$url = remove_query_arg(['paged', 'page'], $url);