diff --git a/frontend/README.md b/frontend/README.md
index 85f9468..883fe95 100644
--- a/frontend/README.md
+++ b/frontend/README.md
@@ -26,6 +26,15 @@ npm run dev
 
 后端 API 默认通过 Vite 代理转发到 `http://localhost:7861`（见 `vite.config.ts`）。
 
+开发环境默认启用前端 Mock。如需联调真实后端，使用：
+
+```bash
+VITE_ENABLE_MOCK=false npm run dev
+```
+
+生产构建默认不包含 Mock；仅在演示构建中可显式设置
+`VITE_ENABLE_MOCK=true`。
+
 ## 构建
 
 ```bash
diff --git a/frontend/scripts/regression-training-log-layout.mjs b/frontend/scripts/regression-training-log-layout.mjs
index 05245ea..215b245 100644
--- a/frontend/scripts/regression-training-log-layout.mjs
+++ b/frontend/scripts/regression-training-log-layout.mjs
@@ -117,7 +117,8 @@ assert.match(
 assert.match(source, /import \{ getSystemInfo \} from '@\/api\/modules\/system'/, '训练概览必须复用系统 GPU 监控数据源')
 assert.match(source, /Promise\.all\(\[datasetPromise, loadLog\(currentTask\), loadGpuStatus\(\)\]\)/, 'GPU 状态必须和训练日志一起刷新')
 assert.match(source, /if \(refreshInFlight\) return/, '轮询刷新必须阻止并发重叠')
-assert.match(source, /onUnmounted\([\s\S]*?clearInterval\(timer\)/, '组件卸载时必须清理轮询定时器')
+assert.match(source, /usePolling/, '训练日志必须使用统一轮询机制')
+assert.match(source, /stopPolling\(\)/, '训练结束后必须停止轮询')
 
 const overview = findElements(
   templateAst,
diff --git a/frontend/src/App.vue b/frontend/src/App.vue
index 856a59f..c9dc7e9 100644
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -1,7 +1,9 @@
 <script setup lang="ts">
-// 根组件，仅承载路由出口
+import zhCn from 'element-plus/es/locale/lang/zh-cn'
 </script>
 
 <template>
-  <router-view />
+  <el-config-provider :locale="zhCn">
+    <router-view />
+  </el-config-provider>
 </template>
diff --git a/frontend/src/api/request.ts b/frontend/src/api/request.ts
index 3ee62a7..4c44b53 100644
--- a/frontend/src/api/request.ts
+++ b/frontend/src/api/request.ts
@@ -17,10 +17,6 @@ const service: AxiosInstance = axios.create({
   timeout: 30000,
 })
 
-// 安装 mock adapter（拦截所有 axios 请求返回 mock 数据，方便前端独立开发调试）
-import { installMockAdapter } from '@/mock/adapter'
-installMockAdapter(service)
-
 // 请求拦截器
 service.interceptors.request.use(
   (config) => config,
diff --git a/frontend/src/env.d.ts b/frontend/src/env.d.ts
index 323c78a..443a7fa 100644
--- a/frontend/src/env.d.ts
+++ b/frontend/src/env.d.ts
@@ -1,5 +1,14 @@
 /// <reference types="vite/client" />
 
+interface ImportMetaEnv {
+  /** 是否启用前端 Mock；开发环境默认开启，生产环境默认关闭。 */
+  readonly VITE_ENABLE_MOCK?: 'true' | 'false'
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv
+}
+
 declare module '*.vue' {
   import type { DefineComponent } from 'vue'
   const component: DefineComponent<{}, {}, any>
diff --git a/frontend/src/layouts/MainLayout.vue b/frontend/src/layouts/MainLayout.vue
index 0a67cda..6cb75d7 100644
--- a/frontend/src/layouts/MainLayout.vue
+++ b/frontend/src/layouts/MainLayout.vue
@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import { onMounted, onUnmounted } from 'vue'
 import { useRoute } from 'vue-router'
+import '@/assets/font-awesome/css/font-awesome.min.css'
 import AppSidebar from '@/components/AppSidebar.vue'
 import AppHeader from '@/components/AppHeader.vue'
 import { useSystemStore } from '@/stores/system'
diff --git a/frontend/src/main.ts b/frontend/src/main.ts
index c2516ea..b4496e6 100644
--- a/frontend/src/main.ts
+++ b/frontend/src/main.ts
@@ -1,17 +1,13 @@
 import { createApp } from 'vue'
 import { createPinia } from 'pinia'
-import ElementPlus from 'element-plus'
-import zhCn from 'element-plus/es/locale/lang/zh-cn'
-import 'element-plus/dist/index.css'
 
-// Font Awesome 图标
-import '@/assets/font-awesome/css/font-awesome.min.css'
-
-// ECharts（按需引入）+ vue-echarts 组件
-import '@/plugins/echarts'
-import VChart from 'vue-echarts'
+// 这三个能力通过函数或指令使用，无法由模板组件扫描自动补充样式。
+import 'element-plus/es/components/message/style/css'
+import 'element-plus/es/components/message-box/style/css'
+import 'element-plus/es/components/loading/style/css'
 
 import App from './App.vue'
+import service from '@/api/request'
 import router from './router'
 import './styles/index.scss'
 
@@ -19,7 +15,19 @@ const app = createApp(App)
 
 app.use(createPinia())
 app.use(router)
-app.use(ElementPlus, { locale: zhCn })
-app.component('VChart', VChart)
 
-app.mount('#app')
+async function bootstrap() {
+  // 开发环境默认使用 Mock；生产环境只有显式开启时才加载整套 Mock 数据。
+  // 这样真实部署不会被前端适配器截断请求，也不会把 Mock 数据打进首屏包。
+  const shouldEnableMock = import.meta.env.VITE_ENABLE_MOCK === 'true'
+    || (import.meta.env.DEV && import.meta.env.VITE_ENABLE_MOCK !== 'false')
+
+  if (shouldEnableMock) {
+    const { installMockAdapter } = await import('@/mock/adapter')
+    installMockAdapter(service)
+  }
+
+  app.mount('#app')
+}
+
+void bootstrap()
diff --git a/frontend/src/plugins/echarts.ts b/frontend/src/plugins/echarts.ts
index 827115c..ce1737c 100644
--- a/frontend/src/plugins/echarts.ts
+++ b/frontend/src/plugins/echarts.ts
@@ -1,26 +1,20 @@
 /**
- * ECharts 按需引入
- * 仅注册训练曲线所需的模块，避免引入全量包以减小体积
+ * 服务看板图表按需注册。
  */
 import { use } from 'echarts/core'
 import { CanvasRenderer } from 'echarts/renderers'
-import { BarChart, LineChart, PieChart } from 'echarts/charts'
+import { BarChart, PieChart } from 'echarts/charts'
 import {
   GridComponent,
   TooltipComponent,
   LegendComponent,
-  DataZoomComponent,
-  MarkLineComponent,
 } from 'echarts/components'
 
 use([
   CanvasRenderer,
   BarChart,
-  LineChart,
   PieChart,
   GridComponent,
   TooltipComponent,
   LegendComponent,
-  DataZoomComponent,
-  MarkLineComponent,
 ])
diff --git a/frontend/src/stores/models.ts b/frontend/src/stores/models.ts
index e86c93d..aa866b6 100644
--- a/frontend/src/stores/models.ts
+++ b/frontend/src/stores/models.ts
@@ -10,15 +10,24 @@ import type { ModelItem } from '@/types'
 export const useModelsStore = defineStore('models', () => {
   const list = ref<ModelItem[]>([])
   const loaded = ref(false)
+  let pendingLoad: Promise<void> | null = null
 
   async function load(force = false) {
     if (loaded.value && !force) return
-    try {
-      list.value = (await getModelList()) || []
-      loaded.value = true
-    } catch {
-      list.value = []
-    }
+    if (pendingLoad && !force) return pendingLoad
+
+    pendingLoad = (async () => {
+      try {
+        list.value = (await getModelList()) || []
+        loaded.value = true
+      } catch {
+        list.value = []
+      } finally {
+        pendingLoad = null
+      }
+    })()
+
+    return pendingLoad
   }
 
   /** 根据 id 获取模型名 */
diff --git a/frontend/src/stores/system.ts b/frontend/src/stores/system.ts
index 0bcb304..376bb29 100644
--- a/frontend/src/stores/system.ts
+++ b/frontend/src/stores/system.ts
@@ -10,19 +10,29 @@ import type { HealthMetrics } from '@/types'
 export const useSystemStore = defineStore('system', () => {
   const metrics = ref<HealthMetrics>({})
   let timer: ReturnType<typeof setInterval> | null = null
+  let fetching = false
 
   async function fetchMetrics() {
+    if (fetching || document.hidden) return
+    fetching = true
     try {
       metrics.value = await getHealth()
     } catch {
       // 静默失败，顶部栏非关键
+    } finally {
+      fetching = false
     }
   }
 
+  function handleVisibilityChange() {
+    if (!document.hidden) void fetchMetrics()
+  }
+
   function start() {
     if (timer) return
-    fetchMetrics()
+    void fetchMetrics()
     timer = setInterval(fetchMetrics, 30000)
+    document.addEventListener('visibilitychange', handleVisibilityChange)
   }
 
   function stop() {
@@ -30,6 +40,7 @@ export const useSystemStore = defineStore('system', () => {
       clearInterval(timer)
       timer = null
     }
+    document.removeEventListener('visibilitychange', handleVisibilityChange)
   }
 
   return { metrics, fetchMetrics, start, stop }
diff --git a/frontend/src/views/dashboard/DashboardView.vue b/frontend/src/views/dashboard/DashboardView.vue
index 1cd346e..23495fc 100644
--- a/frontend/src/views/dashboard/DashboardView.vue
+++ b/frontend/src/views/dashboard/DashboardView.vue
@@ -1,6 +1,8 @@
 <script setup lang="ts">
 import { computed, ref } from 'vue'
 import { useRouter } from 'vue-router'
+import VChart from 'vue-echarts'
+import '@/plugins/echarts'
 import type { EChartsOption } from 'echarts'
 
 type ServiceState = 'normal' | 'busy' | 'error'
@@ -253,7 +255,7 @@ const loginDurationStats: LoginDurationStat[] = [
 
 const loginDurationChartOption = computed<EChartsOption>(() => ({
   animationDuration: 500,
-  grid: { top: 8, right: 60, bottom: 6, left: 8, containLabel: true },
+  grid: { top: 8, right: 12, bottom: 6, left: 8, containLabel: true },
   tooltip: {
     trigger: 'axis',
     axisPointer: { type: 'shadow' },
@@ -284,7 +286,7 @@ const loginDurationChartOption = computed<EChartsOption>(() => ({
       barMaxWidth: 18,
       barCategoryGap: '34%',
       itemStyle: { color: '#4f46e5', borderRadius: [0, 4, 4, 0] },
-      label: { show: true, position: 'right', distance: 6, color: '#64748b', fontSize: 11, formatter: '{c} 小时' },
+      label: { show: true, position: 'insideRight', distance: 6, color: '#ffffff', fontSize: 11, formatter: '{c} 小时' },
     },
   ],
 }))
diff --git a/frontend/src/views/eval/create/DimensionFormFields.vue b/frontend/src/views/eval/create/DimensionFormFields.vue
index eb06a23..15ee68c 100644
--- a/frontend/src/views/eval/create/DimensionFormFields.vue
+++ b/frontend/src/views/eval/create/DimensionFormFields.vue
@@ -1,11 +1,16 @@
 <script setup lang="ts">
-import { computed, watch } from 'vue'
-import { MdEditor } from 'md-editor-v3'
-import 'md-editor-v3/lib/style.css'
+import { computed, defineAsyncComponent, watch } from 'vue'
 import { EVAL_METHODS, EVAL_METHOD_PROMPTS } from '@/constants/dimension'
 import { DIMENSION_TYPE_MAP } from '@/constants'
 import type { DimensionType, ModelItem } from '@/types'
 
+// 编辑器体积较大，仅在用户进入包含 Prompt 的指标配置时加载。
+const MdEditor = defineAsyncComponent(async () => {
+  await import('md-editor-v3/lib/style.css')
+  const module = await import('md-editor-v3')
+  return module.MdEditor
+})
+
 export interface DimensionFormDraft {
   type: DimensionType | ''
   description: string
diff --git a/frontend/src/views/fine-tune/FineTuneListView.vue b/frontend/src/views/fine-tune/FineTuneListView.vue
index 4617a6f..66b7026 100644
--- a/frontend/src/views/fine-tune/FineTuneListView.vue
+++ b/frontend/src/views/fine-tune/FineTuneListView.vue
@@ -1,9 +1,10 @@
 <script setup lang="ts">
-import { ref, computed, onMounted, onUnmounted } from 'vue'
+import { ref, computed, onMounted } from 'vue'
 import { useRouter } from 'vue-router'
 import { ElMessage } from 'element-plus'
 import DataTablePage from '@/components/DataTablePage.vue'
 import ModelStatusTag from '@/components/ModelStatusTag.vue'
+import { usePolling } from '@/composables/usePolling'
 import { useModelsStore } from '@/stores/models'
 import {
   getFineTuneList,
@@ -44,14 +45,10 @@ const filteredList = computed(() => {
   })
 })
 
-let progressTimer: ReturnType<typeof setInterval> | null = null
-
 async function loadData() {
   loading.value = true
   try {
     dataList.value = (await getFineTuneList()) || []
-    // 列表加载完成后，立即获取一次运行中任务的进度
-    refreshProgress()
   } catch {
     // 拦截器已提示
   } finally {
@@ -101,14 +98,13 @@ function formatDateTime(value?: string) {
   return new Date(value).toLocaleString('zh-CN', { hour12: false })
 }
 
-onMounted(() => {
-  modelsStore.load()
-  loadData()
-  progressTimer = setInterval(refreshProgress, 5000)
-})
+const { start: startProgressPolling } = usePolling(refreshProgress, 5000, { immediate: false })
 
-onUnmounted(() => {
-  if (progressTimer) clearInterval(progressTimer)
+onMounted(async () => {
+  void modelsStore.load()
+  await loadData()
+  await refreshProgress()
+  startProgressPolling()
 })
 </script>
 
diff --git a/frontend/src/views/login/LoginView.vue b/frontend/src/views/login/LoginView.vue
index aa89d4b..3b5e5e8 100644
--- a/frontend/src/views/login/LoginView.vue
+++ b/frontend/src/views/login/LoginView.vue
@@ -136,7 +136,7 @@ async function handleLogin() {
   position: relative;
   color: #fff;
   background-color: #121127;
-  background-image: url('@/assets/login-hero-flow.png');
+  background-image: url('@/assets/login-hero-flow.jpg');
   background-size: cover;
   background-position: center;
   overflow: hidden;
diff --git a/frontend/src/views/system/HardwareView.vue b/frontend/src/views/system/HardwareView.vue
index 765cfcd..0ea331c 100644
--- a/frontend/src/views/system/HardwareView.vue
+++ b/frontend/src/views/system/HardwareView.vue
@@ -1,6 +1,8 @@
 <script setup lang="ts">
 import { computed, nextTick, onMounted, onUnmounted, ref } from 'vue'
+import VChart from 'vue-echarts'
 import PageCard from '@/components/PageCard.vue'
+import '@/plugins/echarts-hardware'
 import { getSystemInfo } from '@/api/modules/system'
 import type { GpuInfo, SystemInfo } from '@/types'
 
diff --git a/frontend/src/views/system/LogsView.vue b/frontend/src/views/system/LogsView.vue
index 02e8839..9b8319a 100644
--- a/frontend/src/views/system/LogsView.vue
+++ b/frontend/src/views/system/LogsView.vue
@@ -1,7 +1,8 @@
 <script setup lang="ts">
-import { ref, computed, onMounted, onUnmounted, watch } from 'vue'
+import { ref, computed, onMounted, watch } from 'vue'
 import PageCard from '@/components/PageCard.vue'
 import { useCountdown } from '@/composables/useCountdown'
+import { usePolling } from '@/composables/usePolling'
 import {
   getLogFiles,
   getLogContent,
@@ -30,29 +31,26 @@ const fullContent = ref('')
 // 自动刷新
 const refreshInterval = ref(10)
 const { remaining, start: startCountdown, stop: stopCountdown } = useCountdown(10)
-let refreshTimer: ReturnType<typeof setInterval> | null = null
 
-const filteredContent = computed(() => {
-  if (!keyword.value.trim()) return fullContent.value
+const filteredLog = computed(() => {
+  if (!keyword.value.trim()) return { content: fullContent.value, count: 0 }
   const kw = keyword.value.toLowerCase().trim()
-  return fullContent.value
+  const lines = fullContent.value
     .split('\n')
     .filter((line) => line.toLowerCase().includes(kw))
-    .join('\n')
+  return { content: lines.join('\n'), count: lines.length }
 })
 
-const matchCount = computed(() => {
-  if (!keyword.value.trim()) return 0
-  const kw = keyword.value.toLowerCase().trim()
-  return fullContent.value.split('\n').filter((line) => line.toLowerCase().includes(kw)).length
-})
+const filteredContent = computed(() => filteredLog.value.content)
+const matchCount = computed(() => filteredLog.value.count)
 
 async function loadSysFiles() {
   try {
     sysFiles.value = (await getLogFiles(sysDate.value)) || []
     if (sysFiles.value.length > 0) {
-      sysSelected.value = sysFiles.value[0].file
-      loadSysContent()
+      const firstFile = sysFiles.value[0].file
+      if (sysSelected.value === firstFile) void loadSysContent()
+      else sysSelected.value = firstFile
     } else {
       sysContent.value = '该日期暂无日志文件'
     }
@@ -76,8 +74,9 @@ async function loadTrainFiles() {
   try {
     trainFiles.value = (await getTrainingLogFiles()) || []
     if (trainFiles.value.length > 0) {
-      trainSelected.value = trainFiles.value[0].file
-      loadTrainContent()
+      const firstFile = trainFiles.value[0].file
+      if (trainSelected.value === firstFile) void loadTrainContent()
+      else trainSelected.value = firstFile
     } else {
       trainContent.value = '暂无训练日志'
     }
@@ -97,29 +96,28 @@ async function loadTrainContent() {
   }
 }
 
-function refresh() {
+async function refresh() {
   if (activeTab.value === 'system') {
-    loadSysContent()
+    await loadSysContent()
   } else {
-    loadTrainContent()
+    await loadTrainContent()
   }
 }
 
+const { start: startPolling, stop: stopPolling } = usePolling(
+  refresh,
+  () => refreshInterval.value * 1000,
+  { immediate: false },
+)
+
 function startAutoRefresh() {
-  stopAutoRefresh()
+  stopPolling()
   if (refreshInterval.value === 0) {
     stopCountdown()
     return
   }
   startCountdown()
-  refreshTimer = setInterval(refresh, refreshInterval.value * 1000)
-}
-
-function stopAutoRefresh() {
-  if (refreshTimer) {
-    clearInterval(refreshTimer)
-    refreshTimer = null
-  }
+  startPolling()
 }
 
 watch(refreshInterval, startAutoRefresh)
@@ -135,8 +133,6 @@ onMounted(() => {
   loadSysFiles()
   startAutoRefresh()
 })
-
-onUnmounted(stopAutoRefresh)
 </script>
 
 <template>
diff --git a/frontend/src/views/system/TrainingLogView.vue b/frontend/src/views/system/TrainingLogView.vue
index c17800a..3f4eebd 100644
--- a/frontend/src/views/system/TrainingLogView.vue
+++ b/frontend/src/views/system/TrainingLogView.vue
@@ -1,9 +1,12 @@
 <script setup lang="ts">
-import { ref, reactive, computed, onMounted, onUnmounted } from 'vue'
+import { ref, reactive, computed, onMounted } from 'vue'
 import { useRoute } from 'vue-router'
+import VChart from 'vue-echarts'
 import PageCard from '@/components/PageCard.vue'
 import ModelStatusTag from '@/components/ModelStatusTag.vue'
 import TrainingTaskOverview from './training-log/TrainingTaskOverview.vue'
+import { usePolling } from '@/composables/usePolling'
+import '@/plugins/echarts-training-log'
 import { useModelsStore } from '@/stores/models'
 import { getFineTune } from '@/api/modules/fineTune'
 import { getTrainingLogFiles, getTrainingLogContent } from '@/api/modules/log'
@@ -55,7 +58,6 @@ const paramsExpanded = ref(false)
 const GPU_PREVIEW_LIMIT = 4
 const gpuExpanded = ref(false)
 
-let timer: ReturnType<typeof setInterval> | null = null
 let refreshInFlight = false
 
 /** 三个曲线的 ECharts 配置（响应式，数据变化自动重绘） */
@@ -257,14 +259,16 @@ async function refreshAll() {
   }
 }
 
-onMounted(() => {
-  modelsStore.load()
-  refreshAll()
-  timer = setInterval(refreshAll, 5000)
-})
+const isTerminalTask = () => ['completed', 'failed', 'stopped', 'cancelled'].includes(task.value?.status || '')
+const { start: startPolling, stop: stopPolling } = usePolling(async () => {
+  await refreshAll()
+  if (isTerminalTask()) stopPolling()
+}, 5000, { immediate: false })
 
-onUnmounted(() => {
-  if (timer) clearInterval(timer)
+onMounted(async () => {
+  void modelsStore.load()
+  await refreshAll()
+  if (!isTerminalTask()) startPolling()
 })
 </script>
 
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index f70c797..4e77070 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -10,10 +10,10 @@ export default defineConfig({
   plugins: [
     vue(),
     AutoImport({
-      resolvers: [ElementPlusResolver({ importStyle: false })],
+      resolvers: [ElementPlusResolver({ importStyle: 'css' })],
     }),
     Components({
-      resolvers: [ElementPlusResolver({ importStyle: false })],
+      resolvers: [ElementPlusResolver({ importStyle: 'css' })],
     }),
   ],
   resolve: {