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/store/modules/dict-store.ts

@@ -1,5 +1,5 @@
 import { store } from "@/store";
-import DictAPI, { type DictItemOption } from "@/api/system/dict-api";
+import DictAPI, { type DictItemOption } from "@/api/system/dict";
 import { STORAGE_KEYS } from "@/constants";
 
 export const useDictStore = defineStore("dict", () => {

src/store/modules/permission-store.ts

@@ -3,7 +3,7 @@ import { constantRoutes } from "@/router";
 import { store } from "@/store";
 import router from "@/router";
 
-import MenuAPI, { type RouteVO } from "@/api/system/menu-api";
+import MenuAPI, { type RouteVO } from "@/api/system/menu";
 const modules = import.meta.glob("../../views/**/**.vue");
 const Layout = () => import("../../layouts/index.vue");
 

src/store/modules/tenant-store.ts

@@ -1,5 +1,5 @@
 import { store } from "@/store";
-import TenantAPI, { type TenantInfo } from "@/api/system/tenant-api";
+import TenantAPI, { type TenantInfo } from "@/api/system/tenant";
 import { STORAGE_KEYS } from "@/constants";
 
 /**

src/store/modules/user-store.ts

@@ -1,13 +1,14 @@
 import { store } from "@/store";
 
-import AuthAPI, { type LoginRequest } from "@/api/auth-api";
-import UserAPI, { type UserInfo } from "@/api/system/user-api";
+import AuthAPI from "@/api/auth";
+import UserAPI from "@/api/system/user";
+import type { LoginRequest } from "@/types/api";
 
 import { AuthStorage } from "@/utils/auth";
 import { usePermissionStoreHook } from "@/store/modules/permission-store";
 import { useDictStoreHook } from "@/store/modules/dict-store";
 import { useTagsViewStore } from "@/store";
-import { cleanupWebSocket } from "@/plugins/websocket";
+import { cleanupWebSocket } from "@/utils/websocket";
 
 export const useUserStore = defineStore("user", () => {
   // 用户信息