feat: 会员中心全局暗色主题重构

阶段一：全局覆盖
- 新增 dark-override.css (450+ 行)，覆盖所有 Element UI 组件暗色样式
  - 输入框、表格、Tabs、弹窗、按钮、分页、复选框、下拉框等
  - 侧边栏、顶栏、主内容区暗色背景
  - 滚动条、日期选择器、消息面板等
- header.php 引入 dark-override.css

阶段二：页面独立 CSS 暗色化（22 个文件）
- 白色背景 #fff → #161b22
- 浅灰背景 #F3F5F9 → #0d1117
- 深色文字 #171725/#1E2736 → #E6E8EB
- 灰色文字 #8692B0 → #8B949E
- 浅色边框 #E6E7EB → rgba(255,255,255,0.06)
- 悬停背景 #F5F7FA → #21262d

clientarea/hgcloud/css/account.css

@@ -23,7 +23,7 @@
   font-family: Helvetica;
   font-weight: bold;
   line-height: 0.32rem;
-  color: #1e2736;
+  color: #E6E8EB;
 }
 .name-country {
   margin-top: 0.1rem;
@@ -48,7 +48,7 @@
   cursor: pointer;
   margin-left: 0.1rem;
   font-size: 0.14rem;
-  color: #1e2736;
+  color: #E6E8EB;
 }
 .bule-text {
   color: var(--color-primary) !important;
@@ -101,7 +101,7 @@
   font-size: 0.13rem;
   font-weight: 500;
   height: 0.2rem;
-  color: #8692b0;
+  color: #8B949E;
   margin-bottom: 0.25rem;
 }
 .box-item-b > .el-input,
@@ -131,7 +131,7 @@
   justify-content: center;
 }
 .el-input.is-disabled .el-input__inner {
-  background: #ffffff;
+  background: #161b22;
 }
 .el-input__inner {
   height: 0.46rem;
@@ -143,7 +143,7 @@
 .input-with-select .el-input-group__prepend {
   width: 60px;
   border: none;
-  background: #ffffff;
+  background: #161b22;
 }
 .edit-icon {
   cursor: pointer;
@@ -212,7 +212,7 @@
   color: rgba(255, 255, 255, 0.9);
 }
 .a-text {
-  color: #171725;
+  color: #E6E8EB;
 }
 .a-text:hover {
   color: var(--color-primary);
@@ -223,7 +223,7 @@
   margin-right: 0.05rem;
 }
 .is-read {
-  color: #8692b0;
+  color: #8B949E;
 }
 .no-read {
   color: var(--color-primary);
@@ -300,7 +300,7 @@ th {
 }
 .line-item text {
   font-size: 16px;
-  color: #1e2736;
+  color: #E6E8EB;
 }
 .type-btn {
   width: 100%;
@@ -310,7 +310,7 @@ th {
 .code-pass-select {
   width: auto;
   height: 44px;
-  border: 1px solid #e6e7eb;
+  border: 1px solid rgba(255,255,255,0.06);
   border-right: none;
 }
 .el-message-box__btns {
@@ -446,7 +446,7 @@ th {
   .mob-item-row-notes {
     font-size: 0.26rem;
     line-height: 0.27rem;
-    color: #8692b0;
+    color: #8B949E;
   }
   .mob-item-row2-name {
     font-size: 0.32rem;
@@ -464,7 +464,7 @@ th {
   .bottom-text {
     font-size: 0.26rem;
     line-height: 0.27rem;
-    color: #8692b0;
+    color: #8B949E;
     margin: 0.4rem 0;
     display: flex;
     justify-content: center;