refactor: 重命名 API 文件并更新引用路径

- 重命名 13 个 API 文件，去掉 -api 后缀
  * src/api/auth-api.ts  auth.ts
  * src/api/codegen-api.ts  codegen.ts
  * src/api/file-api.ts  file.ts
  * src/api/system/*.ts (9个文件)

- 批量更新 50+ 处 API 引用路径
- 修复 websocket 和枚举导入路径
- 确保零编码问题（使用 UTF-8 编码）

src/components/Upload/FileUpload.vue

@@ -53,7 +53,7 @@ import {
   UploadRequestOptions,
 } from "element-plus";
 
-import FileAPI, { FileInfo } from "@/api/file-api";
+import FileAPI, { FileInfo } from "@/api/file";
 
 const props = defineProps({
   /**

src/components/Upload/MultiImageUpload.vue

@@ -40,7 +40,7 @@
 </template>
 <script setup lang="ts">
 import { UploadRawFile, UploadRequestOptions, UploadUserFile } from "element-plus";
-import FileAPI, { FileInfo } from "@/api/file-api";
+import FileAPI, { FileInfo } from "@/api/file";
 
 const props = defineProps({
   /**

src/components/Upload/SingleImageUpload.vue

@@ -33,7 +33,7 @@
 
 <script setup lang="ts">
 import { UploadRawFile, UploadRequestOptions } from "element-plus";
-import FileAPI, { FileInfo } from "@/api/file-api";
+import FileAPI, { FileInfo } from "@/api/file";
 
 const props = defineProps({
   /**

src/components/WangEditor/index.vue

@@ -34,7 +34,7 @@ import { Toolbar, Editor } from "@wangeditor-next/editor-for-vue";
 import { IToolbarConfig, IEditorConfig } from "@wangeditor-next/editor";
 
 // 文件上传 API
-import FileAPI from "@/api/file-api";
+import FileAPI from "@/api/file";
 
 // 上传图片回调函数类型
 type InsertFnType = (_url: string, _alt: string, _href: string) => void;