refactor: 完成项目整体目录重构与路径别名配置

1.  重构项目文件结构，统一文件存放位置与命名规则
2.  配置tsconfig路径别名，替换原有相对路径导入
3.  迁移drama-status枚举到dramas.types统一管理
4.  新增全局配置文件与工具类，补充完整注释与文档
5.  修复所有导入路径与依赖引用问题

decorators/require-permissions.decorator.ts

@@ -1,6 +1,12 @@
-import { SetMetadata } from '@nestjs/common';
+/**
+ * RequirePermissions decorator.
+ * @file 接口权限声明装饰器
+ * @module decorators/require-permissions.decorator
+ * @author zhxiao1124
+ */
 
-export const REQUIRED_PERMISSIONS_METADATA = 'admin:required-permissions';
+import { SetMetadata } from "@nestjs/common";
 
-export const RequirePermissions = (...permissions: string[]) =>
-  SetMetadata(REQUIRED_PERMISSIONS_METADATA, permissions);
+export const REQUIRED_PERMISSIONS_METADATA = "admin:required-permissions";
+
+export const RequirePermissions = (...permissions: string[]) => SetMetadata(REQUIRED_PERMISSIONS_METADATA, permissions);