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/auth/views/NotificationsView.vue

@@ -2,7 +2,7 @@
 import { ElMessage } from 'element-plus'
 import { onMounted, ref } from 'vue'
 
-import { fetchNotifications, markNotificationRead, type NotificationItem } from '@/api/notifications'
+import { fetchNotifications, markNotificationRead, type NotificationItem } from '@/features/auth/api/notifications'
 import { formatDateTime } from '@/utils/time'
 
 const loading = ref(false)

frontend/src/features/auth/views/ProfileView.vue

@@ -21,7 +21,7 @@ import { ElMessage } from 'element-plus'
 import { computed, onMounted, reactive, ref } from 'vue'
 import { useRouter } from 'vue-router'
 
-import { uploadFile } from '@/api/files'
+import { uploadFile } from '@/shared/api/files'
 import { useSessionStore } from '@/stores/session'
 import { realnameStatusLabel } from '@/utils/statusLabels'
 

frontend/src/features/auth/views/RealnameView.vue

@@ -13,7 +13,7 @@ import { ElMessage } from 'element-plus'
 import { computed, onMounted, reactive, ref } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 
-import { getRealnameStatus, startRealname, type RealnameStatus } from '@/api/realname'
+import { getRealnameStatus, startRealname, type RealnameStatus } from '@/features/auth/api/realname'
 import { useSessionStore } from '@/stores/session'
 import { realnameStatusLabel } from '@/utils/statusLabels'
 import { formatDateTime } from '@/utils/time'