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/signin.js

@@ -29,8 +29,11 @@
     });
   }
 
-  function initSignin() {
-    var buttons = Array.prototype.slice.call(document.querySelectorAll('[data-signin-btn]'));
+  function initSignin(scope) {
+    scope = scope || document;
+    var buttons = [];
+    if (scope.nodeType === 1 && scope.matches('[data-signin-btn]')) buttons.push(scope);
+    if (scope.querySelectorAll) scope.querySelectorAll('[data-signin-btn]').forEach(function (button) { buttons.push(button); });
     var freshButtons = buttons.filter(function (button) {
       return button.dataset.aksrtSigninInitialized !== '1';
     });
@@ -40,12 +43,19 @@
       button.dataset.aksrtSigninInitialized = '1';
     });
 
+    function elements(selector) {
+      var items = [];
+      if (scope.nodeType === 1 && scope.matches(selector)) items.push(scope);
+      if (scope.querySelectorAll) scope.querySelectorAll(selector).forEach(function (item) { items.push(item); });
+      return items;
+    }
+
     function statuses() {
-      return document.querySelectorAll('[data-signin-status]');
+      return elements('[data-signin-status]');
     }
 
     function currentButtons() {
-      return document.querySelectorAll('[data-signin-btn]');
+      return elements('[data-signin-btn]');
     }
 
     function setStatus(text) {
@@ -98,7 +108,8 @@
     }
 
     function captchaMount() {
-      return document.querySelector('[data-signin-captcha]');
+      if (scope.nodeType === 1 && scope.matches('[data-signin-captcha]')) return scope;
+      return scope.querySelector ? scope.querySelector('[data-signin-captcha]') : null;
     }
 
     function doSignin(captchaPayload) {
@@ -115,7 +126,7 @@
         }
 
         notyf(result.json.message || '签到成功', 'success', 5, 'aksrt-balance-signin-toast');
-        document.querySelectorAll('[data-credits-value]').forEach(function (element) {
+        elements('[data-credits-value]').forEach(function (element) {
           element.textContent = Number(result.json.balance || 0).toLocaleString();
         });
         setButtonState('done');
@@ -149,12 +160,6 @@
     refresh();
   }
 
-  if (document.readyState === 'loading') {
-    document.addEventListener('DOMContentLoaded', initSignin);
-  } else {
-    initSignin();
-  }
-
   if (window.AksrtFrontend && typeof window.AksrtFrontend.register === 'function') {
     window.AksrtFrontend.register('signin', initSignin);
   }