feat: full parity pass - suspend enforcement, report modal polish, wechat notify

- Restriction: add is_suspended/get_active_suspend; comment block now covers
  suspend (小黑屋) in addition to mute, with reason in the deny message
- FrontSubmitSave::persist: block post/draft/edit submission for suspended
  users (reference-theme semantics: 小黑屋 loses all publishing rights)
- report.js: close icon switched from fa-times to the SVG sprite ic-close
  (#icon-close), same as reference theme; textareas gain autoHeight growth
  (hidden 'other reason' box skips the first measurement)
- WeChatNotify: NOTIFY_TYPES now includes report/system so report results
  and account restriction notices fan out to WeChat template messages;
  generic title/description fallback for template values
- contract tests: +3 tests (suspend enforcement, modal polish, wechat types)

assets/js/report.js

@@ -79,7 +79,7 @@
 
     // 弹窗头：参考主题 edit-header 同构（关闭钮 + 红色警示徽标 + 标题）。
     html += '<div class="mb10 edit-header touch">';
-    html += '<button type="button" class="close" data-aksrt-modal-close aria-label="关闭"><i class="fa fa-times" aria-hidden="true"></i></button>';
+    html += '<button type="button" class="close" data-aksrt-modal-close aria-label="关闭"><svg class="ic-close" aria-hidden="true"><use xlink:href="#icon-close"></use></svg></button>';
     html += '<b class="flex ac c-red"><span class="toggle-radius mr10 c-red"><i class="fa fa-exclamation-triangle" aria-hidden="true"></i></span>' + escapeHtml(title) + '</b>';
     html += '</div>';
 
@@ -284,7 +284,24 @@
       });
   }
 
+  function bindAutoHeight(textarea) {
+    // 对齐参考主题 autoHeight 行为：随内容自动增高，最小保持初始行数高度。
+    // 隐藏中的 textarea（如“其它原因”）跳过首次计算，待可见后按实际高度增长。
+    if (!textarea || textarea.dataset.aksrtAutoHeight === '1') return;
+    textarea.dataset.aksrtAutoHeight = '1';
+    var minHeight = 0;
+    var grow = function () {
+      if (!minHeight) minHeight = textarea.offsetHeight || 0;
+      textarea.style.height = 'auto';
+      textarea.style.height = Math.max(textarea.scrollHeight, minHeight) + 'px';
+    };
+    textarea.addEventListener('input', grow);
+    if (textarea.offsetHeight > 0) grow();
+  }
+
   function bindReportModal(shell) {
+    shell.querySelectorAll('textarea.form-control').forEach(bindAutoHeight);
+
     shell.addEventListener('click', function (event) {
       // 原因徽章：单选 active（参考主题 .active.badg 焦点色），其它原因展开文本框。
       // 参考主题行为：重复点击已选徽章保持选中（先全清再激活），不做反选。