fix(widgets): restore single-card reference UI for search and quote widgets

The 搜索框 and 一言 sidebar widgets fell into the generic renderer branch, so
they rendered a .jio-panel card wrapping a second bespoke card
(.jio-widget-search / .jio-widget-quote). In-article 一言 also used
divergent modifier classes and an extra hover rule.

- search: render through the shared jio_get_search_box() (legacy keyword,
  history and category pickers) inside one reference card, mirroring the
  reference widget's markup and title default 「搜索」
- quote: render the reference .yiyan-box card itself as the click root; the
  shell now emits only the reference widget-container/title wrapper
- article 一言: adopt the reference class lists for header, footer and the
  standalone after-article box; drop the invented yiyan--* modifiers and
  the duplicate hover/opacity rules
- client: fill .cn/.en in the reference order (first line .cn, second .en)
  and drop the stale window.JioYiyan bridge plus the dead qv-yiyan.php AJAX
  path in runtime main.js
- schema: replace the ad-hoc search_style radio with the reference switches
  (keywords, history, input category, more_cats) and default title
- assets: enqueue assets/js/yiyan.js through the quote widget's asset list

Tests: widget-system suite 820/821 (the one failure is the pre-existing
frontend-lifecycle theme-init stub); new search/quote card contracts pass.

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

assets/widgets/frontend.js

@@ -74,11 +74,6 @@
     }
   }
 
-  function initQuote(figure) {
-    if (!once(figure, 'Quote')) return;
-    if (window.JioYiyan) window.JioYiyan.init(figure);
-  }
-
   function errorMarkup(page, append) {
     var i18n = config.i18n || {};
     return '<div class="jio-widget-request-error" role="alert"><span>' + (i18n.error || '加载失败，请重试。') + '</span><button type="button" data-widget-retry data-retry-page="' + page + '" data-retry-append="' + (append ? '1' : '0') + '">' + (i18n.retry || '重试') + '</button></div>';
@@ -357,7 +352,6 @@
   function scan(root) {
     var scope = root || document;
     scope.querySelectorAll('.jio-widget-video[data-video-url]').forEach(initVideo);
-    scope.querySelectorAll('.jio-widget-quote').forEach(initQuote);
     if (scope.matches && scope.matches('[data-widget-items]')) initItems(scope);
     scope.querySelectorAll('[data-widget-items]').forEach(initItems);
     scope.querySelectorAll('.widget-tab-post').forEach(initTabs);