docs(ai-outfit): drop product_id from prompt, keep only insert-title

Prompt offers only {title}; product_id is used for Excel column B and the
output filename (货号.jpg), not for AI generation. Update §7/§10 and the
mockup (remove the 插入货号 chip + {product_id} from the sample prompt).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/ui-ai-outfit.html

@@ -229,10 +229,9 @@
         </div>
 
         <div class="grp"><div class="grp-t">通用话术</div>
-          <div class="ta">为商品「<span class="ph">{title}</span>」（货号 <span class="ph">{product_id}</span>）生成人物上身实穿效果图：真人模特正面穿着这件衣服，完整保留款式、版型、颜色与印花图案，自然光、纯色棚拍背景，电商主图风格，不加文字与促销标签。</div>
+          <div class="ta">为商品「<span class="ph">{title}</span>」生成人物上身实穿效果图：真人模特正面穿着这件衣服，完整保留款式、版型、颜色与印花图案，自然光、纯色棚拍背景，电商主图风格，不加文字与促销标签。</div>
           <div class="promptbar">
             <span class="pchip">插入<span class="pp">{title}</span></span>
-            <span class="pchip">插入<span class="pp">{product_id}</span></span>
             <span class="pchip act">⤢ 预览最终提示词</span>
           </div>
           <div class="promptbar" style="margin-top:8px">