文档: 按 Ant/Arco Design 风格重构官网首页，修正 API 参考，完善 i18n (#41)

重构：
- 首页 Hero 重设计：双列布局（标题+CTA+指标 / macOS 风代码窗口）
- 引入渐变文字、pulse 徽章、悬停带动画的主按钮
- 功能卡片加 SVG 图标、悬停提升效果、部分卡片变成可点击链接
- 新增 HomepageShowcase 截图轮播区：Tab 切换四个核心页面（仪表盘/任务/存储/多节点）
- 全站换 Arco 蓝 (#165dff) 作为主色，紫色 (#8f4bff) 作为辅助
- 导航栏加毛玻璃效果、表格加圆角与边框、菜单项圆角化
- 深色模式配色整体收敛

内容修正：
- API 参考补全遗漏的端点：auth logout/profile、records batch-delete、
  storage-targets star/usage/google-drive、notifications test、dashboard timeline、settings
- 把 API 表格改为"方法/端点/说明"三列，加响应结构说明
- 中英文 API 文档同步更新

i18n：
- code.json 补充 Hero、Features、Showcase 全部新翻译键
- 校对：16 个中英文档 frontmatter 完全对齐，无漏译

构建：双语 build 通过、产物 3.3MB

docs-site/src/components/HomepageFeatures/styles.module.css

@@ -1,20 +1,148 @@
-.features {
+.section {
+  padding: 6rem 0 4rem;
+}
+
+.sectionHead {
+  text-align: center;
+  max-width: 720px;
+  margin: 0 auto 3rem;
+}
+
+.sectionTag {
+  display: inline-block;
+  font-size: 12px;
+  font-weight: 600;
+  letter-spacing: 0.15em;
+  color: var(--ifm-color-primary);
+  padding: 4px 12px;
+  background: rgba(22, 93, 255, 0.08);
+  border-radius: 4px;
+  margin-bottom: 1rem;
+}
+
+[data-theme='dark'] .sectionTag {
+  background: rgba(96, 126, 255, 0.18);
+  color: var(--ifm-color-primary-lighter);
+}
+
+.sectionTitle {
+  font-size: clamp(1.8rem, 3vw, 2.5rem);
+  line-height: 1.2;
+  letter-spacing: -0.02em;
+  font-weight: 700;
+  margin: 0 0 1rem;
+  color: var(--ifm-heading-color);
+}
+
+.sectionSubtitle {
+  font-size: 1.05rem;
+  line-height: 1.65;
+  color: var(--ifm-color-content-secondary);
+  margin: 0;
+}
+
+.grid {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 1.25rem;
+}
+
+@media (max-width: 996px) {
+  .section {
+    padding: 3.5rem 0 2rem;
+  }
+  .grid {
+    grid-template-columns: 1fr;
+  }
+}
+
+@media (min-width: 997px) and (max-width: 1200px) {
+  .grid {
+    grid-template-columns: repeat(2, 1fr);
+  }
+}
+
+.featureCard,
+.featureCardLink {
+  position: relative;
+  display: flex;
+  flex-direction: column;
+  padding: 1.75rem;
+  background: var(--ifm-background-color);
+  border: 1px solid var(--ifm-color-emphasis-200);
+  border-radius: 12px;
+  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
+  text-decoration: none !important;
+  color: inherit;
+  height: 100%;
+}
+
+.featureCardLink:hover {
+  transform: translateY(-3px);
+  border-color: var(--ifm-color-primary);
+  box-shadow: 0 12px 30px -8px rgba(22, 93, 255, 0.18);
+  color: inherit;
+}
+
+[data-theme='dark'] .featureCard,
+[data-theme='dark'] .featureCardLink {
+  background: rgba(255, 255, 255, 0.02);
+  border-color: rgba(255, 255, 255, 0.08);
+}
+
+[data-theme='dark'] .featureCardLink:hover {
+  background: rgba(64, 128, 255, 0.05);
+  border-color: var(--ifm-color-primary);
+  box-shadow: 0 12px 30px -8px rgba(64, 128, 255, 0.25);
+}
+
+.iconWrap {
+  width: 48px;
+  height: 48px;
+  border-radius: 10px;
   display: flex;
   align-items: center;
-  padding: 3rem 0;
-  width: 100%;
+  justify-content: center;
+  background: linear-gradient(135deg, rgba(22, 93, 255, 0.1) 0%, rgba(143, 75, 255, 0.08) 100%);
+  color: var(--ifm-color-primary);
+  margin-bottom: 1.25rem;
 }
 
-.feature {
-  padding: 1.2rem 1rem;
+[data-theme='dark'] .iconWrap {
+  background: linear-gradient(135deg, rgba(96, 126, 255, 0.15) 0%, rgba(143, 75, 255, 0.12) 100%);
+  color: var(--ifm-color-primary-lighter);
 }
 
-.feature h3 {
+.featureTitle {
   font-size: 1.15rem;
-  margin-bottom: 0.5rem;
+  font-weight: 600;
+  margin: 0 0 0.6rem;
+  color: var(--ifm-heading-color);
+  letter-spacing: -0.01em;
 }
 
-.feature p {
-  color: var(--ifm-color-content-secondary);
+.featureDesc {
+  font-size: 0.95rem;
   line-height: 1.65;
+  color: var(--ifm-color-content-secondary);
+  margin: 0;
+  flex: 1;
+}
+
+.featureLink {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  margin-top: 1rem;
+  font-size: 13px;
+  font-weight: 500;
+  color: var(--ifm-color-primary);
+}
+
+.featureArrow {
+  transition: transform 0.2s ease;
+}
+
+.featureCardLink:hover .featureArrow {
+  transform: translateX(4px);
 }