feat: add Xiaohongshu QR code to website, README, guide, and USB build

website/index.html

@@ -583,6 +583,13 @@
                 <span class="en hidden">Scan to add on WeChat</span>
             </p>
         </div>
+        <div style="text-align: center;">
+            <img src="xhs-qr.jpg" alt="Xiaohongshu QR" style="width: 200px; height: 200px; border-radius: 12px; border: 1px solid var(--border); object-fit: cover;">
+            <p style="margin-top: 12px; color: var(--text-dim); font-size: 14px;">
+                <span class="zh">小红书关注</span>
+                <span class="en hidden">Follow on Xiaohongshu</span>
+            </p>
+        </div>
         <div style="text-align: left;">
             <p style="margin-bottom: 16px; font-size: 16px;">
                 <span style="color: var(--text-dim);">Email:</span>