feat(runtime): 全站前端脚本统一接入 AksrtFrontend 全局 DOM 生命周期

- rehydrate.js 新增 boot()/aksrt:ready 事件，支持 boot 后晚注册立即以 init 触发
- aksrt-runtime.js 初始加载改走 AksrtFrontend.boot，tooltip/倒计时注册为组件
- 约 30 个前端脚本（首页、评论、支付、路由、页面叶子、widgets）
  从直接 DOMContentLoaded 迁移为 AksrtFrontend.register，并加幂等标记
- section-navs 依赖改为 aksrt-runtime，保证注册时序
- 清理死代码：删除孤儿 loader.js/main.js 及 runtime/page-navs 遗留副本
- loader.js 移除已迁移模块的 tbquire 路径映射，main.js 相应瘦身
- build-public-assets.mjs 增加 runtime/main.min.js 自动压缩步骤
- 新增 4 个契约测试（homepage-dom/rehydrate-runtime/global-dom-init/
  public-bundle-parity），3 个既有 harness 适配注册表初始化方式

assets/js/section-navs.js

@@ -40,8 +40,10 @@
     return count >= MIN_HEADINGS ? html : '';
   }
 
-  function fillBoxes(listsHtml) {
-    document.querySelectorAll(NAVBOX).forEach(function (box) {
+  function fillBoxes(listsHtml, scope) {
+    var boxes = Array.prototype.slice.call(scope.querySelectorAll(NAVBOX));
+    if (scope.nodeType === 1 && scope.matches(NAVBOX)) boxes.unshift(scope);
+    boxes.forEach(function (box) {
       var existing = box.querySelector('.' + NAV_CLASS);
       if (existing) {
         existing.innerHTML = listsHtml;
@@ -75,7 +77,13 @@
     window.scrollTo({ top: top, behavior: 'smooth' });
   }
 
+  var clicksBound = false;
+  var scrollspyBound = false;
+  var autoHashHandled = false;
+
   function bindClicks() {
+    if (clicksBound) return;
+    clicksBound = true;
     document.addEventListener('click', function (e) {
       var a = e.target && e.target.closest ? e.target.closest('.' + NAV_CLASS + ' a[href^="#"]') : null;
       if (!a) return;
@@ -87,9 +95,11 @@
     });
   }
 
-  function scrollspy() {
-    var links = document.querySelectorAll('.' + NAV_CLASS + ' a[href^="#"]');
+  function scrollspy(scope) {
+    if (scrollspyBound) return;
+    var links = scope.querySelectorAll('.' + NAV_CLASS + ' a[href^="#"]');
     if (!links.length) return;
+    scrollspyBound = true;
     var map = [];
     links.forEach(function (a) {
       var id = a.getAttribute('href').slice(1);
@@ -111,37 +121,32 @@
   }
 
   function autoHash() {
-    if (window.location.hash) {
-      setTimeout(function () {
-        smoothTo(window.location.hash);
-      }, 40);
-    }
+    if (autoHashHandled || !window.location.hash) return;
+    autoHashHandled = true;
+    setTimeout(function () {
+      smoothTo(window.location.hash);
+    }, 40);
   }
 
-  function init() {
+  function init(scope) {
+    scope = scope || document;
     if (document.querySelector('.posts-nav-box .toc-list, .posts-nav-box.toc-widget .toc-list')) {
       return;
     }
-    var root = document.querySelector('[data-nav], .article-content, .entry-content, main.article');
+    var root = scope.nodeType === 1 && scope.matches('[data-nav], .article-content, .entry-content, main.article')
+      ? scope
+      : scope.querySelector('[data-nav], .article-content, .entry-content, main.article');
     if (!root) return;
     var listsHtml = buildLists(root);
     if (!listsHtml) return;
     if (!document.querySelector(NAVBOX) && !document.querySelector('.' + NAV_CLASS)) {
       return;
     }
-    fillBoxes(listsHtml);
+    fillBoxes(listsHtml, document);
     bindClicks();
-    scrollspy();
+    scrollspy(document);
     autoHash();
   }
 
-  if (window.AksrtFrontend && typeof window.AksrtFrontend.register === 'function') {
-    window.AksrtFrontend.register('aksrt-section-navs', function () {
-      init();
-    });
-  } else if (document.readyState === 'loading') {
-    document.addEventListener('DOMContentLoaded', init);
-  } else {
-    init();
-  }
+  window.AksrtFrontend.register('aksrt-section-navs', init);
 })();