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/views/system/dict/dict-item.vue

@@ -155,7 +155,7 @@
 
 <script setup lang="ts">
 import type { TagProps } from "element-plus";
-import DictAPI, { DictItemPageQuery, DictItemPageVO, DictItemForm } from "@/api/system/dict-api";
+import DictAPI, { DictItemPageQuery, DictItemPageVO, DictItemForm } from "@/api/system/dict";
 
 const route = useRoute();
 

src/views/system/dict/index.vue

@@ -137,7 +137,7 @@ defineOptions({
   inherititems: false,
 });
 
-import DictAPI, { DictPageQuery, DictPageVO, DictForm } from "@/api/system/dict-api";
+import DictAPI, { DictPageQuery, DictPageVO, DictForm } from "@/api/system/dict";
 
 import router from "@/router";