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

filters/http.filter.ts

@@ -0,0 +1,79 @@
+import {
+  ArgumentsHost,
+  Catch,
+  ExceptionFilter,
+  HttpException,
+  HttpStatus,
+} from '@nestjs/common';
+import { Request, Response } from 'express';
+import { LogsService } from '../../modules/logs/logs.service';
+import { getRequestCost } from '../utils/request-context.util';
+
+@Catch()
+export class HttpExceptionFilter implements ExceptionFilter {
+  constructor(private readonly logsService: LogsService) {}
+
+  catch(exception: unknown, host: ArgumentsHost) {
+    const ctx = host.switchToHttp();
+    const request = ctx.getRequest<
+      Request & { requestId?: string; adminId?: number; user?: { id: number } }
+    >();
+    const response = ctx.getResponse<Response>();
+    const statusCode =
+      exception instanceof HttpException
+        ? exception.getStatus()
+        : HttpStatus.INTERNAL_SERVER_ERROR;
+    const message = this.getMessage(exception, statusCode);
+    const requestId = request.requestId ?? '';
+    const costMs = getRequestCost(request);
+
+    this.logsService.recordRequest({
+      requestId,
+      method: request.method,
+      path: request.originalUrl ?? request.url,
+      query: request.query,
+      body: request.body,
+      statusCode,
+      responseCode: statusCode,
+      message,
+      costMs,
+      userId: request.user?.id,
+      adminId: request.adminId,
+      ip: request.ip,
+      userAgent: request.get('user-agent'),
+      errorStack: exception instanceof Error ? exception.stack : undefined,
+    });
+
+    response.status(statusCode).json({
+      code: statusCode,
+      data: {},
+      message,
+      timestamp: Date.now(),
+      requestId,
+      cost: `${costMs}ms`,
+    });
+  }
+
+  private getMessage(exception: unknown, statusCode: number): string {
+    if (exception instanceof HttpException) {
+      const response = exception.getResponse();
+      if (typeof response === 'string') {
+        return response;
+      }
+      if (
+        response &&
+        typeof response === 'object' &&
+        'message' in response
+      ) {
+        const message = (response as { message: string | string[] }).message;
+        return Array.isArray(message) ? message.join('; ') : message;
+      }
+    }
+
+    if (exception instanceof Error && statusCode === HttpStatus.INTERNAL_SERVER_ERROR) {
+      return exception.message || 'Internal server error';
+    }
+
+    return 'Internal server error';
+  }
+}