fix: +86前缀被挤出 + 注册页加语言切换 + 语言按钮样式

- prepend 固定 width:70px 避免 +86 被挤出
- 注册页 login-jump-btn 内加入 lang-box 语言切换
- lang-box 用 font-size:0 消除文本节点间的 / 分隔符
- 登录注册页 lang-box 样式统一

clientarea/hgcloud/css/login.css

@@ -70,16 +70,19 @@
 /* 语言切换 */
 .login-jump-btn .lang-box {
   display: flex;
-  gap: 8px;
+  gap: 4px;
+  font-size: 0;
 }
 
 .login-jump-btn .lang-box span {
   color: rgba(139, 148, 158, 0.6);
   cursor: pointer;
   font-size: 13px;
-  padding: 4px 8px;
-  border-radius: 4px;
+  padding: 6px 12px;
+  border-radius: 6px;
   transition: all 0.2s;
+  line-height: 1;
+  display: inline-block;
 }
 
 .login-jump-btn .lang-box span:hover {
@@ -88,7 +91,7 @@
 
 .login-jump-btn .lang-box span.active {
   color: #FFFFFF;
-  background: rgba(22, 93, 255, 0.15);
+  background: rgba(22, 93, 255, 0.2);
 }
 
 /* ---- 表单区域 — 无卡片 ---- */
@@ -332,16 +335,17 @@
   border-right: 1px solid rgba(255,255,255,0.06) !important;
   border-radius: 8px 0 0 8px !important;
   color: #E6E8EB !important;
-  padding: 0 10px !important;
+  padding: 0 !important;
+  width: 70px !important;
+  min-width: 70px !important;
 }
 
 .input-with-select .el-input-group__prepend .el-input__inner {
   background: transparent !important;
   border: none !important;
   color: #E6E8EB !important;
-  padding: 0 !important;
-  height: auto !important;
-  line-height: inherit !important;
+  padding-left: 12px !important;
+  padding-right: 20px !important;
 }
 
 .input-with-select .el-input-group__prepend .el-select .el-input .el-input__inner {
@@ -351,6 +355,7 @@
 
 .input-with-select .el-input-group__prepend .el-input__suffix {
   color: rgba(139, 148, 158, 0.5) !important;
+  right: 2px !important;
 }
 
 .input-with-select .el-input-group__prepend .el-select .el-input.is-focus .el-input__inner {