feat: add comprehensive backend topics and fix build issues

## 新增内容

### 附录文档扩展
- 扩展前端项目架构文档 (frontend-project-architecture.md)
- 扩展后端项目架构文档 (backend-project-architecture.md)
- 扩展数据治理文档 (data-governance.md)
- 扩展数据可视化文档 (data-visualization.md)
- 扩展分布式系统文档 (distributed-systems.md)
- 扩展高可用文档 (high-availability.md)
- 扩展单体到微服务文档 (monolith-to-microservices.md)
- 扩展系统设计方法论文档 (system-design-methodology.md)
- 扩展 Docker 容器文档 (docker-containers.md)
- 扩展 Kubernetes 文档 (kubernetes.md)
- 扩展 Linux 基础文档 (linux-basics.md)
- 扩展神经网络文档 (neural-networks.md)

### 新增交互式组件
- 数据治理组件: DataQualityDemo, DataGovernanceFrameworkDemo, DataLineageDemo
- 数据可视化组件: ChartTypeSelectorDemo, DashboardLayoutDemo
- 分布式系统组件: CAPTheoremDemo, ConsistencyModelsDemo, DistributedChallengesDemo
- 高可用组件: AvailabilityCalculatorDemo, FailoverStrategyDemo
- 系统设计组件: SystemDesignStepsDemo, CapacityEstimationDemo
- Docker 容器组件: DockerArchitectureDemo, DockerLifecycleDemo
- Kubernetes 组件: K8sArchitectureDemo, K8sWorkloadsDemo
- Linux 基础组件: LinuxFileSystemDemo, LinuxCommandDemo, LinuxPermissionsDemo
- 神经网络组件: NeuronDemo, NetworkLayersDemo, NetworkArchitectureDemo
- 单体到微服务组件: ArchEvolutionDemo
- 项目架构组件: ProjectArchitectureComparisonDemo
- 附录导航组件: AppendixFlowMap

### 英文版重构
- 将 en-us 目录重命名为 en
- 更新相关配置和组件中的语言代码

## Bug 修复
- 修复 index.js 中重复的组件导入语句导致的 build 失败
- 恢复被注释的 InvertedIndexDemo 和 SearchRelevanceDemo 导入
- 修复 HomeFeatures.vue 中 en-us 与 config.mjs 中 en 不一致导致的语言切换问题

## 其他改进
- 添加构建脚本 (scripts/build.mjs)
- 更新依赖版本

docs/.vitepress/theme/components/appendix/computer-fundamentals/BiosUefiInteractiveDemo.vue

@@ -155,7 +155,7 @@
 </template>
 
 <script setup>
-import { ref, computed, watch } from 'vue'
+import { ref, computed, watch, onUnmounted } from 'vue'
 
 const stage = ref(0)
 const expandedOp = ref(-1)
@@ -313,15 +313,26 @@ function getDeviceStatus(i) {
   return '等待'
 }
 
+const postTimer = ref(null)
+const hwTimer = ref(null)
+const bootTimer = ref(null)
+
+onUnmounted(() => {
+  if (postTimer.value) clearInterval(postTimer.value)
+  if (hwTimer.value) clearInterval(hwTimer.value)
+  if (bootTimer.value) clearInterval(bootTimer.value)
+})
+
 // POST 自检动画
 watch(() => stage.value, (newStage) => {
+  if (postTimer.value) clearInterval(postTimer.value)
   if (newStage === 1) {
     currentCheck.value = 0
-    const interval = setInterval(() => {
+    postTimer.value = setInterval(() => {
       if (currentCheck.value < postItems.length) {
         currentCheck.value++
       } else {
-        clearInterval(interval)
+        if (postTimer.value) clearInterval(postTimer.value)
       }
     }, 600)
   }
@@ -329,15 +340,16 @@ watch(() => stage.value, (newStage) => {
 
 // 硬件初始化动画
 watch(() => stage.value, (newStage) => {
+  if (hwTimer.value) clearInterval(hwTimer.value)
   if (newStage === 2) {
     activeHw.value = 0
     hwProgress.value = 0
-    const interval = setInterval(() => {
+    hwTimer.value = setInterval(() => {
       if (hwProgress.value < 100) {
         hwProgress.value += 5
         activeHw.value = Math.floor(hwProgress.value / 20) % hardwareItems.length
       } else {
-        clearInterval(interval)
+        if (hwTimer.value) clearInterval(hwTimer.value)
       }
     }, 100)
   }
@@ -345,11 +357,12 @@ watch(() => stage.value, (newStage) => {
 
 // 启动设备搜索动画
 watch(() => stage.value, (newStage) => {
+  if (bootTimer.value) clearInterval(bootTimer.value)
   if (newStage === 3) {
     currentDevice.value = 0
     foundDevice.value = -1
     let device = 0
-    const interval = setInterval(() => {
+    bootTimer.value = setInterval(() => {
       if (device < bootDevices.length) {
         currentDevice.value = device
         // 假设第一个设备（硬盘）可启动
@@ -357,11 +370,11 @@ watch(() => stage.value, (newStage) => {
           setTimeout(() => {
             foundDevice.value = device
           }, 400)
-          clearInterval(interval)
+          if (bootTimer.value) clearInterval(bootTimer.value)
         }
         device++
       } else {
-        clearInterval(interval)
+        if (bootTimer.value) clearInterval(bootTimer.value)
       }
     }, 800)
   }
@@ -387,6 +400,9 @@ function reset() {
   hwProgress.value = 0
   currentDevice.value = 0
   foundDevice.value = -1
+  if (postTimer.value) clearInterval(postTimer.value)
+  if (hwTimer.value) clearInterval(hwTimer.value)
+  if (bootTimer.value) clearInterval(bootTimer.value)
 }
 </script>