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>

inc/helpers/jio-single-render.php

@@ -249,7 +249,7 @@ if (!function_exists('jio_single_render_content_footer')) :
 		<?php if (!empty($settings['yiyan_footer'])) : ?>
 			<?php
 			jio_render_yiyan_block([
-				'class' => 'article-yiyan yiyan-box jio-yiyan yiyan--footer',
+				'class' => 'article-yiyan theme-box text-center radius8 main-shadow yiyan-box jio-yiyan',
 			]);
 			?>
 		<?php endif; ?>
@@ -604,7 +604,7 @@ if (!function_exists('jio_single_render_article')) :
 				<?php if (!empty($settings['yiyan_header'])) : ?>
 					<?php
 					jio_render_yiyan_block([
-						'class' => 'article-yiyan yiyan-box jio-yiyan yiyan--header theme-box text-center radius8 main-shadow',
+						'class' => 'article-yiyan theme-box text-center radius8 main-shadow yiyan-box jio-yiyan',
 					]);
 					?>
 				<?php endif; ?>
@@ -662,10 +662,9 @@ if (!function_exists('jio_single_render_after_box')) :
 				'class' => 'yiyan-box main-bg theme-box text-center box-body radius8 main-shadow jio-yiyan',
 			]);
 		}
-
-			if (!empty($settings['authordesc'])) {
-				jio_single_render_author_card($ctx);
-			}
+		if (!empty($settings['authordesc'])) {
+			jio_single_render_author_card($ctx);
+		}
 
 		jio_single_render_prevnext($ctx);
 		jio_single_render_related($ctx);