feat(web): 设置中心缓存管理与文件预览资产工具

- 新增 documentPreviewAssets 工具，统一从 URL/Blob/File 推断预览类型（image/pdf/file/unsupported）
- SettingsView/SettingsView.js/settingsModelHelper 新增系统缓存管理区块，调用 /settings/cache/clear 并展示清理结果；useSettings/services 适配
- WorkbenchAiFilePreviewDialog/useWorkbenchAiFilePreview 接入预览资产工具，workbenchAiComposerModel 调整文件处理
- ReceiptFolder/LogDetailView/DigitalEmployeeWorkRecords/travelReimbursementAttachmentModel 配套适配
- 新增 settings-cache-management-section 测试，更新 settings-llm/rendering/receipt-folder-view/composer-components/attachment-association 测试

web/src/views/LogDetailView.vue

@@ -34,10 +34,6 @@
               <i class="mdi mdi-refresh"></i>
               <span>刷新详情</span>
             </button>
-            <button class="refresh-btn" type="button" @click="openAgentTraceCenter">
-              <i class="mdi mdi-timeline-text-outline"></i>
-              <span>查看 Trace</span>
-            </button>
           </div>
         </article>
 
@@ -445,14 +441,6 @@ function backToLogs() {
   router.push({ name: 'app-settings', query: { section: 'systemLogs' } })
 }
 
-function openAgentTraceCenter() {
-  const runId = String(hermesRun.value?.run_id || '').trim()
-  if (!runId) {
-    return
-  }
-  router.push({ name: 'app-settings', query: { section: 'agentTraces', run_id: runId } })
-}
-
 watch(
   () => [route.params.logKind, route.params.logId],
   () => {