refactor: rename the theme brand and every identifier from AKSRT to Jio

Full-project rename. `git grep -i aksrt` is now empty apart from the
DBMigrator 3.3.0 changelog note that documents the rename itself.

Code identifiers
- PHP namespace AKSRT\ -> Jio\ (composer PSR-4 + 378 declarations)
- global constants AKSRT_* -> JIO_* (VERSION/DIR/URI, PAY_TYPE_*, CAPTCHA_*)
- procedural functions, hooks, options, meta keys, table names,
  cookies, query vars, ajax actions and nonces: aksrt_ -> jio_
- text domain aksrt -> jio; Theme Name -> Jio
- JS globals: aksrtData/aksrtAdminData/... -> jioData/jioAdminData/...,
  window.AKSRTCaptcha & friends -> window.JioCaptcha, Aksrt* -> Jio*
- Vue components Aks*.vue -> Jio*.vue (15 files renamed + imports)
- CSS classes/data-attrs/custom properties: aksrt- -> jio-
- REST namespace aksrt/v1 -> jio/v1 (incl. payment gateway callbacks)

Storage layer
- DB tables {prefix}aksrt_* -> {prefix}jio_*; SCHEMA_VERSION 3.2.0 -> 3.3.0
  so dbDelta creates the new names on install
- widget id_base aksrt_widget_* -> jio_widget_*
- uninstall.php drop list rebuilt from the actual migrator tables
  (dropped 3 stale entries, added the 17 missing ones)

Removed
- hardcoded https://api.aksrt.com/version.json default update endpoint;
  get_endpoint() now reads the 「更新端点」 setting and do_check() no-ops
  when it is empty

Files renamed: inc/helpers/aksrt-*.php -> jio-*.php (54),
assets/admin/src/components/form/Aks*.vue -> Jio*.vue (15).
Build artifacts regenerated: assets/css/build, assets/js/runtime,
assets/admin/build.

Verified: audit-psr4-paths errors=0, audit-admin-contracts errors=0
(warnings=56, unchanged baseline), 813/813 widget-system tests,
44/44 phpunit, php -l clean across all PHP.

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

inc/helpers/jio-yiyan.php

@@ -0,0 +1,75 @@
+<?php
+/**
+ * 一言 (Hitokoto) markup helper.
+ *
+ * Shared shell for single-post placements and the yiyan widget.
+ *
+ * @package Jio
+ */
+
+defined('ABSPATH') || exit;
+
+add_action('wp_ajax_jio_yiyan', 'jio_ajax_yiyan');
+add_action('wp_ajax_nopriv_jio_yiyan', 'jio_ajax_yiyan');
+
+if (!function_exists('jio_ajax_yiyan')) :
+	/** Return one random Chinese/English pair from the theme quote file. */
+	function jio_ajax_yiyan(): void {
+		$custom_file = WP_CONTENT_DIR . '/yiyan.txt';
+		$theme_file = get_template_directory() . '/yiyan/qv-yiyan.txt';
+		$file = is_readable($custom_file) ? $custom_file : $theme_file;
+		$lines = is_readable($file) ? file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) : false;
+		$pairs = [];
+
+		if (is_array($lines)) {
+			// The first line is the reference file's title; the rest alternate EN/CN.
+			array_shift($lines);
+			$lines = array_values(array_map('trim', $lines));
+			for ($i = 0, $length = count($lines); $i + 1 < $length; $i += 2) {
+				if ($lines[$i] !== '' && $lines[$i + 1] !== '') {
+					$pairs[] = ['en' => $lines[$i], 'cn' => $lines[$i + 1]];
+				}
+			}
+		}
+
+		if (!$pairs) {
+			wp_send_json_error(['message' => __('一言内容暂不可用', 'jio')], 503);
+		}
+
+		wp_send_json_success($pairs[array_rand($pairs)]);
+	}
+endif;
+
+if (!function_exists('jio_render_yiyan_block')) :
+	/**
+	 * Shared 一言 shell for single-post placements (and reusable markup).
+	 *
+	 * Reads bilingual pairs from the bundled reference file and supports the
+	 * same optional wp-content/yiyan.txt override used by the reference theme.
+	 *
+	 * @param array<string,mixed> $args {
+	 *     @type string $class    Extra CSS classes on the root.
+	 * }
+	 */
+	function jio_render_yiyan_block(array $args = []): void {
+		echo jio_get_yiyan_markup($args); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Escaped by the markup helper.
+	}
+	function jio_get_yiyan_markup(array $args = []): string {
+		$class    = trim((string) ($args['class'] ?? 'jio-yiyan'));
+
+		if (strpos($class, 'jio-yiyan') === false) {
+			$class = trim($class . ' jio-yiyan');
+		}
+		$html = '<div class="' . esc_attr($class) . '"'
+			. ' data-jio-yiyan'
+			. ' data-endpoint="' . esc_url(admin_url('admin-ajax.php')) . '"'
+			. ' data-toggle="tooltip"'
+			. ' title="' . esc_attr__('点击切换一言', 'jio') . '"'
+			. ' role="button" tabindex="0"'
+			. ' aria-label="' . esc_attr__('点击切换一言', 'jio') . '"'
+			. ' aria-live="polite">'
+			. '<div class="yiyan"><div class="en"></div><div class="cn">' . esc_html__('加载中…', 'jio') . '</div></div>'
+			. '</div>';
+		return $html;
+	}
+endif;