feat: 引入 ECharts 统一图表并完善员工画像标签分页

后端优化员工行为画像服务和辅助函数，完善系统设置模型和
配置持久化，前端引入 ECharts 替换所有图表组件实现统一
渲染，新增员工画像标签分页器和数字员工工作记录组件，优
化工作台响应式布局和登录页过渡动画，完善预算中心和数字
员工页面样式细节。

web/src/composables/useSettings.js

@@ -107,6 +107,10 @@ export function useSettings() {
     pageState.value = maskConfiguredRenderSecret(maskConfiguredModelSecrets(nextState))
     persistSettings(pageState.value)
     updateBrandPreviewFromState(pageState.value)
+
+    if (nextState.appearanceForm?.themeSkin) {
+      setThemeSkin(nextState.appearanceForm.themeSkin)
+    }
   }
 
   async function loadSettingsSnapshot() {
@@ -123,6 +127,7 @@ export function useSettings() {
   function buildSettingsPayload() {
     return {
       companyForm: { ...pageState.value.companyForm },
+      appearanceForm: { ...pageState.value.appearanceForm },
       adminForm: { ...pageState.value.adminForm },
       sessionForm: { ...pageState.value.sessionForm },
       llmForm: buildLlmPayload(pageState.value.llmForm),
@@ -307,10 +312,16 @@ export function useSettings() {
 
   function selectThemeSkin(skinId) {
     setThemeSkin(skinId)
+    pageState.value.appearanceForm.themeSkin = skinId
   }
 
-  function saveAppearanceSection() {
-    toast('界面皮肤已应用到当前浏览器。')
+  async function saveAppearanceSection() {
+    await persistRemoteSettings('界面皮肤已保存并应用到企业配置。', {
+      preserveModelApiKeys: true,
+      preserveAdminPasswords: true,
+      preserveRenderSecret: true,
+      preserveMailPassword: true
+    })
   }
 
   async function saveLlmSection() {