refactor: 重构项目目录与代码结构，清理冗余文件

本次提交进行了大规模的项目结构调整：
1. 调整文件目录归属，将模块代码按功能域重新组织
2. 删除多处冗余的DTO、实体类和模块文件
3. 统一了常量、装饰器、工具类的存放位置
4. 修复了`.gitignore`的日志目录匹配规则
5. 新增了健康检查、认证、用户、剧集、订单等核心业务模块

src/logs/logs.types.ts

@@ -0,0 +1,34 @@
+export interface RequestLogRecord {
+  id?: number;
+  requestId: string;
+  method: string;
+  path: string;
+  query?: unknown;
+  body?: unknown;
+  statusCode: number;
+  responseCode: number;
+  message: string;
+  costMs: number;
+  userId?: number;
+  adminId?: number;
+  ip?: string;
+  userAgent?: string;
+  errorStack?: string;
+  createdAt?: string;
+}
+
+export interface PlaybackErrorLogRecord {
+  id: number;
+  requestId: string;
+  userId?: number;
+  dramaId: number;
+  episodeId: number;
+  playUrl: string;
+  playerErrorCode: string;
+  message: string;
+  progressSeconds?: number;
+  networkType?: string;
+  device?: Record<string, unknown>;
+  occurredAt: string;
+  createdAt: string;
+}