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/widgets/frontend.js

@@ -166,7 +166,7 @@
         }
         if (data.paginate_html) container.insertAdjacentHTML('beforeend', data.paginate_html);
         container.dataset.page = String(data.page || page);
-        scan(container);
+        window.AksrtFrontend.rehydrate(container, 'ajax');
       })
       .catch(function () { container.innerHTML = errorMarkup(); })
 			.finally(function () {
@@ -262,28 +262,28 @@
     requestAnimationFrame(frame);
   }
 
+  function elementsIn(root, selector) {
+    var scope = root || document;
+    var elements = [];
+    if (scope.matches && scope.matches(selector)) elements.push(scope);
+    if (scope.querySelectorAll) {
+      scope.querySelectorAll(selector).forEach(function (element) { elements.push(element); });
+    }
+    return elements;
+  }
+
   function scan(root) {
     var scope = root || document;
-    scope.querySelectorAll('.aksrt-widget-video[data-video-url]').forEach(initVideo);
-    scope.querySelectorAll('.aksrt-widget-toc').forEach(initToc);
-    scope.querySelectorAll('.aksrt-widget-quote').forEach(initQuote);
-    scope.querySelectorAll('[data-widget-items]').forEach(initItems);
-    scope.querySelectorAll('.aksrt-widget-tabs, .widget-tab-post').forEach(initTabs);
-    scope.querySelectorAll('.aksrt-faq').forEach(initFaq);
-    scope.querySelectorAll('.aksrt-feature-intro').forEach(initFeatures);
-    scope.querySelectorAll('[data-count-up]').forEach(initCount);
-    if (typeof window.VanillaTilt !== 'undefined') scope.querySelectorAll('[data-aksrt-tilt]').forEach(function (el) { if (once(el, 'Tilt')) window.VanillaTilt.init(el); });
+    elementsIn(scope, '.aksrt-widget-video[data-video-url]').forEach(initVideo);
+    elementsIn(scope, '.aksrt-widget-toc').forEach(initToc);
+    elementsIn(scope, '.aksrt-widget-quote').forEach(initQuote);
+    elementsIn(scope, '[data-widget-items]').forEach(initItems);
+    elementsIn(scope, '.aksrt-widget-tabs, .widget-tab-post').forEach(initTabs);
+    elementsIn(scope, '.aksrt-faq').forEach(initFaq);
+    elementsIn(scope, '.aksrt-feature-intro').forEach(initFeatures);
+    elementsIn(scope, '[data-count-up]').forEach(initCount);
+    if (typeof window.VanillaTilt !== 'undefined') elementsIn(scope, '[data-aksrt-tilt]').forEach(function (el) { if (once(el, 'Tilt')) window.VanillaTilt.init(el); });
   }
 
-  function ready() {
-    scan(document);
-    if ('MutationObserver' in window) {
-      new MutationObserver(function (mutations) {
-        mutations.forEach(function (mutation) { mutation.addedNodes.forEach(function (node) { if (node.nodeType === 1) scan(node); }); });
-      }).observe(document.body, { childList: true, subtree: true });
-    }
-  }
-
-  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', ready);
-  else ready();
+  window.AksrtFrontend.register('aksrt-widgets', scan);
 })();