style(packages): 优化表单样式和交互体验

- 移除渐变边框效果，简化卡片悬停样式
- 为表单添加内联样式，提升视觉一致性和用户体验
- 调整服务项目输入框布局，使其更紧凑易用

style.css

@@ -1419,30 +1419,9 @@ label {
     background-clip: padding-box;
 }
 
-/* 渐变边框效果 */
-.package-card::before {
-    content: '';
-    position: absolute;
-    top: 0;
-    left: 0;
-    right: 0;
-    bottom: 0;
-    background: linear-gradient(135deg, var(--el-primary-color), var(--el-success-color), var(--el-info-color));
-    border-radius: 12px;
-    z-index: -1;
-    margin: -2px;
-    opacity: 0;
-    transition: opacity 0.35s ease;
-}
-
 .package-card:hover {
     transform: translateY(-6px);
     box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
-    border-color: transparent;
-}
-
-.package-card:hover::before {
-    opacity: 1;
 }
 
 .package-card.inactive {