fix(pay): render paid reading as fragments

src/Core/ResourceMetaBox.php

@@ -89,6 +89,10 @@ class ResourceMetaBox {
             </span>
         </div>
 
+        <p class="aksrt-pmb__hint" id="aksrt-pmb-reading-hint" hidden>
+            <?php esc_html_e('付费阅读价格只作用于正文中的“付费可见”片段；未插入片段时，正文保持公开。', 'aksrt'); ?>
+        </p>
+
         <div class="aksrt-pmb__fields" id="aksrt-pmb-fields" data-disabled="<?php echo $is_paid ? '0' : '1'; ?>">
 
             <!-- 基础价格 -->
@@ -378,6 +382,9 @@ class ResourceMetaBox {
                 var isPaid = t !== 'no';
                 fields.setAttribute('data-disabled', isPaid ? '0' : '1');
 
+                var readingHint = document.getElementById('aksrt-pmb-reading-hint');
+                if (readingHint) readingHint.hidden = t !== 'reading';
+
                 // 根据付费类型显示/隐藏相关字段
                 if (dlFields) dlFields.style.display = (t === 'download') ? '' : 'none';
                 if (galleryFields) galleryFields.style.display = (t === 'gallery') ? '' : 'none';