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

src/users/users.service.ts

@@ -1,9 +1,9 @@
 import { Injectable, NotFoundException, Optional } from "@nestjs/common";
 import { InjectDataSource } from "@nestjs/typeorm";
 import { DataSource } from "typeorm";
-import { PaginatedResponse } from "../../common/dto/paginated-response.dto";
-import { User } from "./entities/user.entity";
-import { UserRecord } from "./interfaces/user-record.interface";
+import { PaginatedResponse } from "@app/common/paginated-response.dto";
+import { User } from "./user.entity";
+import { UserRecord } from "./users.types";
 
 interface UpsertTikTokUserInput {
     tiktokOpenId: string;