docs: 更新新手提示、隐藏虾盘云注册入口

- README 新手提示加入产品经理故事和招募号召
- 删除 SophNet 广告大段内容
- cloud.html 注册按钮置灰，加暂停服务提示
- index.html 虾盘云入口全部改为不可点击

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

website/index.html

@@ -356,9 +356,9 @@
             <span class="zh">🖥 虾盘 MiniPC（即将推出）</span>
             <span class="en hidden">🖥 MiniPC (Coming Soon)</span>
         </a>
-        <a href="https://cloud.u-claw.org" target="_blank" class="btn btn-outline" style="border-color:#ff6b35;color:#ff6b35;">
-            <span class="zh">☁️ 虾盘云 API</span>
-            <span class="en hidden">☁️ Cloud API</span>
+        <a href="#" onclick="return false;" class="btn btn-outline" style="border-color:#ccc;color:#ccc;cursor:not-allowed;">
+            <span class="zh">☁️ 虾盘云 API（暂不可用）</span>
+            <span class="en hidden">☁️ Cloud API (Unavailable)</span>
         </a>
     </div>
 
@@ -669,9 +669,9 @@
             <span class="zh">🖥 虾盘 MiniPC（即将推出）</span>
             <span class="en hidden">🖥 MiniPC (Coming Soon)</span>
         </a>
-        <a href="https://cloud.u-claw.org" target="_blank" class="btn btn-outline" style="border-color:#ff6b35;color:#ff6b35;">
-            <span class="zh">☁️ 虾盘云 API</span>
-            <span class="en hidden">☁️ Cloud API</span>
+        <a href="#" onclick="return false;" class="btn btn-outline" style="border-color:#ccc;color:#ccc;cursor:not-allowed;">
+            <span class="zh">☁️ 虾盘云 API（暂不可用）</span>
+            <span class="en hidden">☁️ Cloud API (Unavailable)</span>
         </a>
     </div>
 </div>
@@ -737,7 +737,7 @@
         <a href="agent.html">远程控制</a> ·
         <a href="https://github.com/openclaw/openclaw">OpenClaw</a> ·
         <a href="mailto:hefangsheng@gmail.com">hefangsheng@gmail.com</a> ·
-        <a href="https://cloud.u-claw.org" style="color:#ff6b35;">虾盘云 API</a>
+        <span style="color:#ccc;cursor:not-allowed;">虾盘云 API（暂不可用）</span>
     </p>
 </footer>