feat: 更新益生元相关文章，引用瓜尔豆胶vs菊粉新内容

web/articles/prebiotics-guide.html

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       <p><strong>核心结论：</strong>益生元是肠道健康的基石，通过选择性喂养有益菌群来间接发挥对宿主的健康效应。选择益生元时应关注种类、剂量、耐受性和临床证据四个维度。从低剂量开始、缓慢加量、交叉补充多种益生元是科学策略。</p>
       <p style="margin-top:0.8rem;">
-        <a href="prebiotics-science.html" style="color:#38a169;font-weight:600;">→ 益生元科学解读：了解益生元的作用机制与科学原理</a><br>
-        <a href="probiotics-science.html" style="color:#38a169;font-weight:600;">→ 益生菌科学解读：了解益生菌的定义与核心菌株</a>
+<a href="prebiotics-science.html" style="color:#38a169;font-weight:600;">→ 益生元科学解读：了解益生元的作用机制与科学原理</a><br>
+      <a href="probiotics-science.html" style="color:#38a169;font-weight:600;">→ 益生菌科学解读：了解益生菌的定义与核心菌株</a><br>
+      <a href="../sales/guar-vs-inulin.html" style="color:#38a169;font-weight:600;">→ 瓜尔豆胶 vs 菊粉：益生元选对不踩坑</a>
       </p>
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   </div>

web/articles/prebiotics-science.html

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         <strong>Polyphenols as Prebiotics</strong> — Ozdal T, Sela DA, Xiao J, et al. "The reciprocal interactions between polyphenols and gut microbiota and effects on bioaccessibility" · <em>Nutrients</em> 2016; 8(2):78 · <a href="https://doi.org/10.3390/nu8020078" target="_blank" rel="noopener">doi:10.3390/nu8020078</a>
         <span class="translation">多酚与肠道菌群的双向互作：多酚被菌群代谢为活性物质，同时调节菌群组成</span>
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+      <li>
+        <strong>Guar Gum as Prebiotic</strong> — Rao SSC et al. "Randomized controlled trial of soluble fiber supplementation in IBS." Am J Gastroenterol 2017; 112:1335-1343 · <a href="https://doi.org/10.1038/ajg.2017.202" target="_blank" rel="noopener">doi:10.1038/ajg.2017.202</a>
+        <span class="translation">瓜尔豆胶在IBS治疗中的临床应用：低剂量（10g/天）显著改善腹胀和腹痛症状，发酵慢胀气少</span>
+      </li>
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         <strong>Modern Diet Fiber Deficiency</strong> — Chinese Nutrition Society. "Dietary Reference Intakes for Chinese Residents (2013)" · <em>China Medical Science Press</em> · <a href="https://doi.org/10.3760/cma.j.issn.1674-1748.2013.12.001" target="_blank" rel="noopener">doi:10.3760/cma.j.issn.1674-1748.2013.12.001</a>
         <span class="translation">中国居民膳食纤维摄入量严重不足，平均仅为推荐摄入量的30-40%</span>
@@ -1107,7 +1111,7 @@
     <p>从益生元的基本定义，到其对肠道菌群的具体作用机制，再到如何选择适合自己的益生元类型，本科学解读为您提供全面的知识体系。记住：益生元不是万能药，但选对、吃对、存对的益生元，确实能成为肠道健康的强大武器。</p>
     <div class="cta-buttons">
       <a href="prebiotics-guide.html" class="btn btn-primary">益生元选购指南</a>
-      <a href="probiotics-science.html" class="btn btn-outline">益生菌科学篇</a>
+      <a href="../sales/guar-vs-inulin.html" class="btn btn-outline">瓜尔豆胶 vs 菊粉对比</a>
     </div>
   </div>
 </section>

web/articles/probiotics-guide.html

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     <div class="cta-buttons">
       <a href="probiotics-science.html" class="btn btn-primary">阅读：益生菌科学解读</a>
       <a href="prebiotics-science.html" class="btn btn-outline">阅读：益生元科学解读</a>
+      <a href="../sales/guar-vs-inulin.html" class="btn btn-outline">瓜尔豆胶 vs 菊粉对比</a>
     </div>
   </div>
 </section>