fix(frontend): close single 1:1 residuals without legacy paths

Unify TOC ownership, real video episode list, slider overlay, single-query related list, Zibll user-card after-box, and new-route subtitle/meta contracts.

assets/js/section-navs.js

@@ -19,19 +19,31 @@
     var navContainer = document.querySelector('[data-nav]');
     if (!navContainer) return;
 
+    // Single-post TOC is owned by page-template.js (.posts-nav-box .toc-list).
+    // Do not invent a second .aksrt-section-nav tree on article singles.
+    if (document.querySelector('.posts-nav-box .toc-list, .posts-nav-box.toc-widget')) {
+      return;
+    }
+
     var headings = navContainer.querySelectorAll(HEADING_SEL);
     if (headings.length < MIN_HEADINGS) return;
 
     var tocContainer = document.querySelector('.posts-nav-lists, .aksrt-section-nav');
     if (!tocContainer) {
+      // Docs / page-navs only: create a dedicated container. Never inject into single sidebars.
+      if (document.body.classList.contains('single') || document.body.classList.contains('single-post')) {
+        return;
+      }
       tocContainer = document.createElement('nav');
       tocContainer.className = 'aksrt-section-nav';
       tocContainer.setAttribute('aria-label', '文章目录');
       var sidebar = document.querySelector('.content-layout__aside, .sidebar, .widget-area');
       if (sidebar) {
         sidebar.insertBefore(tocContainer, sidebar.firstChild);
-      } else {
+      } else if (navContainer.parentNode) {
         navContainer.parentNode.insertBefore(tocContainer, navContainer);
+      } else {
+        return;
       }
     }