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

interceptor/logger.interceptor.ts

@@ -0,0 +1,55 @@
+import {
+  CallHandler,
+  ExecutionContext,
+  Injectable,
+  NestInterceptor,
+} from '@nestjs/common';
+import { Reflector } from '@nestjs/core';
+import { Request, Response } from 'express';
+import { Observable, tap } from 'rxjs';
+import {
+  API_MESSAGE_METADATA,
+} from '../decorators/api-message.decorator';
+import { SUCCESS_MESSAGE } from '../constants/response-message.constants';
+import { getRequestCost } from '../utils/request-context.util';
+import { LogsService } from '../../modules/logs/logs.service';
+
+@Injectable()
+export class RequestLoggingInterceptor implements NestInterceptor {
+  constructor(
+    private readonly logsService: LogsService,
+    private readonly reflector: Reflector,
+  ) {}
+
+  intercept(context: ExecutionContext, next: CallHandler): Observable<unknown> {
+    const http = context.switchToHttp();
+    const request = http.getRequest<
+      Request & { requestId?: string; adminId?: number; user?: { id: number } }
+    >();
+    const response = http.getResponse<Response>();
+    const message =
+      this.reflector.get<string>(API_MESSAGE_METADATA, context.getHandler()) ??
+      SUCCESS_MESSAGE;
+
+    return next.handle().pipe(
+      tap(() => {
+        this.logsService.recordRequest({
+          requestId: request.requestId ?? '',
+          method: request.method,
+          path: request.originalUrl ?? request.url,
+          query: request.query,
+          body: request.body,
+          statusCode: response.statusCode,
+          responseCode: 0,
+          message,
+          costMs: getRequestCost(request),
+          userId: request.user?.id,
+          adminId: request.adminId,
+          ip: request.ip,
+          userAgent: request.get('user-agent'),
+          errorStack: undefined,
+        });
+      }),
+    );
+  }
+}