feat: 添加香港印章样式，优化合同详情印章展示逻辑，提升用户体验

src/assets/css/public/contract.css

@@ -72,6 +72,16 @@
   background: url("https://img.ichunt.com/images/ichunt/202507/04/b3b50c3ae7da89fc1ca83bd63de22b6e.png") no-repeat center;
   background-size: cover;
 }
+.sign-contract-content .stamp-hk {
+  position: absolute;
+  left: 100px;
+  bottom: -30px;
+  width: 180px;
+  height: 180px;
+  display: block;
+  background: url("http://files.ichunt.net/download/1c9c10700102e0h1jrfm30") no-repeat center;
+  background-size: cover;
+}
 .sign-contract-content .company-logo {
   position: absolute;
   left: 0px;

src/assets/css/public/contract.less

@@ -100,6 +100,17 @@
         background-size: cover;
     }
 
+    .stamp-hk {
+        position: absolute;
+        left: 100px;
+        bottom: -30px;
+        width: 180px;
+        height: 180px;
+        display: block;
+        background: url("http://files.ichunt.net/download/1c9c10700102e0h1jrfm30") no-repeat center;
+        background-size: cover;
+    }
+
     .company-logo {
         position: absolute;
         left: 0px;