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>

assets/css/frontend/single-post/cover.css

@@ -138,10 +138,10 @@
   line-height: 1.1;
 }
 .article-avatar name.flex > .img-icon,
-.article-avatar name.flex > .aksrt-identity-certification-icon,
-.article-avatar name.flex > .aksrt-identity-medal,
-.article-avatar name.flex > .aksrt-user-level-icon,
-.article-avatar name.flex > .aksrt-user-level-badge {
+.article-avatar name.flex > .jio-identity-certification-icon,
+.article-avatar name.flex > .jio-identity-medal,
+.article-avatar name.flex > .jio-user-level-icon,
+.article-avatar name.flex > .jio-user-level-badge {
   display: inline-flex;
   align-items: center;
   justify-content: center;
@@ -158,29 +158,29 @@
   flex: 0 0 auto;
 }
 .article-avatar name.flex > .img-icon,
-.article-avatar name.flex > .aksrt-identity-certification-icon,
-.article-avatar name.flex > .aksrt-identity-medal,
-.article-avatar name.flex > .aksrt-user-level-icon {
+.article-avatar name.flex > .jio-identity-certification-icon,
+.article-avatar name.flex > .jio-identity-medal,
+.article-avatar name.flex > .jio-user-level-icon {
   object-fit: contain;
 }
-.article-avatar name.flex > .aksrt-user-level-badge {
+.article-avatar name.flex > .jio-user-level-badge {
   font-size: .78em;
   white-space: nowrap;
 }
 
 
 
-/* Slide cover overlay (injected by aksrt_render_slider overlay_html) */
-.aksrt-slider-wrapper--has-overlay,
-.aksrt-slider-wrapper--scale {
+/* Slide cover overlay (injected by jio_render_slider overlay_html) */
+.jio-slider-wrapper--has-overlay,
+.jio-slider-wrapper--scale {
   position: relative;
   overflow: hidden;
   border-radius: var(--main-radius, var(--radius, 8px));
 }
-.aksrt-slider-wrapper--scale .new-swiper { position: absolute; inset: 0; width: 100%; height: 100%; }
-.aksrt-slider-wrapper--scale .swiper-slide img.fit-cover { width: 100%; height: 100%; object-fit: cover; }
-.aksrt-slider-overlay { position: absolute; inset: 0; z-index: 3; pointer-events: none; }
-.aksrt-slider-overlay .abs-center.left-bottom {
+.jio-slider-wrapper--scale .new-swiper { position: absolute; inset: 0; width: 100%; height: 100%; }
+.jio-slider-wrapper--scale .swiper-slide img.fit-cover { width: 100%; height: 100%; object-fit: cover; }
+.jio-slider-overlay { position: absolute; inset: 0; z-index: 3; pointer-events: none; }
+.jio-slider-overlay .abs-center.left-bottom {
   pointer-events: none;
   padding: 15px 15px 10px 15px;
   color: #fff;
@@ -189,7 +189,7 @@
   width: 100%;
   box-sizing: border-box;
 }
-.aksrt-slider-overlay .article-title,
-.aksrt-slider-overlay .article-title.title-h-left { color: #fff; text-shadow: 0 1px 4px rgba(0,0,0,.45); }
-.aksrt-slider-overlay .breadcrumb a,
-.aksrt-slider-overlay .breadcrumb li { color: rgba(255,255,255,.9); }
+.jio-slider-overlay .article-title,
+.jio-slider-overlay .article-title.title-h-left { color: #fff; text-shadow: 0 1px 4px rgba(0,0,0,.45); }
+.jio-slider-overlay .breadcrumb a,
+.jio-slider-overlay .breadcrumb li { color: rgba(255,255,255,.9); }