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>

src/Settings/FloatButtons.php

@@ -46,25 +46,18 @@ class FloatButtons {
 	}
 
 	/**
-	 * 「更多按钮」出厂默认项（对齐参考主题 float_btn.more 默认值）。
+	 * 「更多按钮」出厂默认项。
+	 *
+	 * 不预设任何第三方指向：悬浮按钮是站点自身的界面，出厂值只给一个图标按钮，
+	 * 链接与悬浮面板由站点自行配置。
 	 */
 	public static function gift_more_button(): array {
-		$img = get_template_directory_uri() . '/assets/img/logo.png';
 		return [
-			'desc'        => '本站同款主题模板',
-			'icon'        => 'zibsvg-gift-color',
+			'desc'        => '',
+			'icon'        => 'jiosvg-gift-color',
 			'link'        => ['url' => '', 'target' => ''],
-			'hover'       => '<a href="https://www.zibll.com/" target="_blank">
-    <div class="flex c-red">
-        <img class="flex0" alt="zibll子比主题" src="' . esc_url($img) . '" height="30">
-        <div class="flex1 ml10">
-            <dt>本站同款主题模板</dt>
-            <div class="px12 mt10 muted-color">zibll子比主题是一款漂亮优雅的网站主题模板，功能强大，配置简单。</div>
-            <div class="but mt10 p2-10 c-blue btn-block px12">查看详情</div>
-        </div>
-    </div>
-</a>',
-			'hover_width' => 240,
+			'hover'       => '',
+			'hover_width' => 200,
 			'pc_s'        => true,
 			'm_s'         => true,
 			'color'       => ['color' => '', 'bg' => 'rgba(255, 111, 6, 0.2)'],