feat: 优化合同详情印章信息展示，动态绑定签署用户信息，提升用户体验

src/views/OrderTrack/goodsDetail.vue

@@ -288,10 +288,10 @@
             <td style="position: relative;">
               <span class="label letter label-width">合同专用章：</span>
               <span class="value-text"></span>
-              <div class="seal" v-if="signContractData.pdfInfo">
-                <p>孔老大</p>
-                <p>18099999999</p>
-                <p>2025-07-04</p>
+              <div class="seal" v-if="signContractData.to_sign_user_info && signContractData.to_sign_user_info.name">
+                <p>{{ signContractData.to_sign_user_info.name }}</p>
+                <p>{{ signContractData.to_sign_user_info.phone }}</p>
+                <p>{{ signContractData.to_sign_user_info.sign_date }}</p>
               </div>
             </td>
           </tr>