refactor: 前端全面替换 any 为 unknown 并统一错误处理，后端用量记录补写请求头/体

- 前端 API 层、stores、conversation 解析器、组件全面替换 any 为 unknown/具体类型
- 错误处理统一使用 parseApiError/getErrorStatus 替代 err.response?.data?.detail 模式
- 后端 handler/TaskService/UsageLifecycle/StreamTracker 链路传递 request_headers/request_body
- streaming/pending 状态更新时可补写客户端和提供商的请求头及请求体
- 新增 TaskService 和 UsageService 相关测试

frontend/src/views/admin/system-settings/ConfigImportDialog.vue

@@ -18,10 +18,10 @@
           <li>全局模型: {{ importPreview.global_models?.length || 0 }} 个</li>
           <li>提供商: {{ importPreview.providers?.length || 0 }} 个</li>
           <li>
-            端点: {{ importPreview.providers?.reduce((sum: number, p: any) => sum + (p.endpoints?.length || 0), 0) }} 个
+            端点: {{ importPreview.providers?.reduce((sum: number, p: { endpoints?: unknown[] }) => sum + (p.endpoints?.length || 0), 0) }} 个
           </li>
           <li>
-            API Keys: {{ importPreview.providers?.reduce((sum: number, p: any) => sum + (p.api_keys?.length || 0), 0) }} 个
+            API Keys: {{ importPreview.providers?.reduce((sum: number, p: { api_keys?: unknown[] }) => sum + (p.api_keys?.length || 0), 0) }} 个
           </li>
           <li v-if="importPreview.ldap_config">
             LDAP 配置: 1 个

frontend/src/views/admin/system-settings/UsersImportDialog.vue

@@ -17,7 +17,7 @@
         <ul class="space-y-1 text-muted-foreground">
           <li>用户: {{ importUsersPreview.users?.length || 0 }} 个</li>
           <li>
-            API Keys: {{ importUsersPreview.users?.reduce((sum: number, u: any) => sum + (u.api_keys?.length || 0), 0) }} 个
+            API Keys: {{ importUsersPreview.users?.reduce((sum: number, u: { api_keys?: unknown[] }) => sum + (u.api_keys?.length || 0), 0) }} 个
           </li>
           <li v-if="importUsersPreview.standalone_keys?.length">
             独立余额 Keys: {{ importUsersPreview.standalone_keys.length }} 个

frontend/src/views/admin/system-settings/composables/useConfigExportImport.ts

@@ -7,6 +7,7 @@ import {
   type UsersExportData,
   type UsersImportResponse,
 } from '@/api/admin'
+import { parseApiError } from '@/utils/errorParser'
 import { log } from '@/utils/logger'
 import type { SystemConfig } from './useSystemConfig'
 
@@ -117,8 +118,8 @@ export function useConfigExportImport(systemConfig: { value: SystemConfig }) {
       mergeModeSelectOpen.value = false
       importResultDialogOpen.value = true
       success('配置导入成功')
-    } catch (err: any) {
-      error(err.response?.data?.detail || '导入配置失败')
+    } catch (err: unknown) {
+      error(parseApiError(err, '导入配置失败'))
       log.error('导入配置失败:', err)
     } finally {
       importLoading.value = false
@@ -199,8 +200,8 @@ export function useConfigExportImport(systemConfig: { value: SystemConfig }) {
       usersMergeModeSelectOpen.value = false
       importUsersResultDialogOpen.value = true
       success('用户数据导入成功')
-    } catch (err: any) {
-      error(err.response?.data?.detail || '导入用户数据失败')
+    } catch (err: unknown) {
+      error(parseApiError(err, '导入用户数据失败'))
       log.error('导入用户数据失败:', err)
     } finally {
       importUsersLoading.value = false

frontend/src/views/admin/system-settings/composables/useScheduledTasks.ts

@@ -167,7 +167,7 @@ export function useScheduledTasks(systemConfig: Ref<SystemConfig>) {
   async function handleQuotaResetConfigSave() {
     const configItems: Array<{
       key: string
-      value: any
+      value: unknown
       description: string
       onSuccess: () => void
     }> = []

frontend/src/views/admin/system-settings/composables/useSystemConfig.ts

@@ -213,7 +213,7 @@ export function useSystemConfig() {
         try {
           const response = await adminApi.getSystemConfig(key)
           if (response.value !== null && response.value !== undefined) {
-            ;(systemConfig.value as any)[key] = response.value
+            ;(systemConfig.value as Record<string, unknown>)[key] = response.value
           }
         } catch {
           // 配置不存在时使用默认值，无需处理