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)

src/User/Restriction.php

@@ -182,6 +182,28 @@ class Restriction {
         return $this->is_restricted($user_id, self::TYPE_BAN, self::SCOPE_GLOBAL);
     }
 
+    /**
+     * Check if a user is in 小黑屋 (active global suspend).
+     *
+     * 对齐参考主题语义：小黑屋用户失去所有发布权限（发帖、评论等）及大部分操作权限。
+     */
+    public function is_suspended(int $user_id): bool {
+        return $this->is_restricted($user_id, self::TYPE_SUSPEND, self::SCOPE_GLOBAL);
+    }
+
+    /**
+     * Get the active suspend restriction for a user (if any).
+     */
+    public function get_active_suspend(int $user_id): ?array {
+        $restrictions = $this->get_user_restrictions($user_id, true);
+        foreach ($restrictions as $r) {
+            if ($r['type'] === self::TYPE_SUSPEND && $r['scope'] === self::SCOPE_GLOBAL) {
+                return $r;
+            }
+        }
+        return null;
+    }
+
     /**
      * Get the active ban restriction for a user (if any).
      */
@@ -214,13 +236,27 @@ class Restriction {
     }
 
     /**
-     * Enforce comment mute.
+     * Enforce comment restriction on submission (mute / 小黑屋).
+     *
+     * 禁言（mute，评论域）与小黑屋（suspend，全域）都会拦截评论——
+     * 对齐参考主题：小黑屋用户失去评论等发布权限。
      */
     public function enforce_comment_mute($post_id) {
         $user_id = get_current_user_id();
-        if ($user_id > 0 && $this->is_restricted($user_id, self::TYPE_MUTE, self::SCOPE_COMMENT)) {
+        if ($user_id <= 0) {
+            return $post_id;
+        }
+        if ($this->is_restricted($user_id, self::TYPE_MUTE, self::SCOPE_COMMENT)) {
             wp_die('您已被限制评论。', '评论限制', ['response' => 403]);
         }
+        if ($this->is_suspended($user_id)) {
+            $suspend = $this->get_active_suspend($user_id);
+            $message = '您已被关入小黑屋，暂时无法评论。';
+            if (!empty($suspend['reason'])) {
+                $message .= '原因：' . $suspend['reason'];
+            }
+            wp_die($message, '发布限制', ['response' => 403]);
+        }
         return $post_id;
     }