chore: 批量更新导入路径到 features 架构

- 更新所有 admin API 文件导入路径
- 更新所有 features 中 Vue 文件的导入路径
- 修复 ChatAttachmentImage 组件导入
- 修复 auth 模块部分导入路径

剩余 ~190 个类型错误待修复（主要是缺失的模块）

frontend/src/features/orders/views/OrdersView.vue

@@ -4,7 +4,7 @@ import { ElMessage } from 'element-plus'
 import { useRoute, useRouter } from 'vue-router'
 import { CopyDocument, Search } from '@element-plus/icons-vue'
 
-import { fetchOrders, type Order } from '@/api/orders'
+import { fetchOrders, type Order } from '@/features/orders'
 import { useSessionStore } from '@/stores/session'
 import { orderStatusLabel } from '@/utils/statusLabels'
 import { formatDateTime } from '@/utils/time'