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

guards/admin-jwt-auth.guard.ts

@@ -0,0 +1,53 @@
+import {
+  CanActivate,
+  ExecutionContext,
+  Injectable,
+  UnauthorizedException,
+} from '@nestjs/common';
+import { JwtService } from '@nestjs/jwt';
+import { Request } from 'express';
+import { AdminUserRecord } from '../interfaces/admin-records.interface';
+import { AdminService } from '../admin.service';
+
+@Injectable()
+export class AdminJwtAuthGuard implements CanActivate {
+  constructor(
+    private readonly jwtService: JwtService,
+    private readonly adminService: AdminService,
+  ) {}
+
+  async canActivate(context: ExecutionContext): Promise<boolean> {
+    const request = context
+      .switchToHttp()
+      .getRequest<Request & { adminUser?: AdminUserRecord; adminId?: number }>();
+    const authHeader = request.get('authorization');
+    const token = authHeader?.startsWith('Bearer ')
+      ? authHeader.slice('Bearer '.length)
+      : undefined;
+
+    if (!token) {
+      throw new UnauthorizedException('Admin not authenticated');
+    }
+
+    try {
+      const payload = await this.jwtService.verifyAsync<{
+        sub: number;
+        type: string;
+      }>(token);
+      if (payload.type !== 'admin') {
+        throw new UnauthorizedException('Admin not authenticated');
+      }
+
+      const adminUser = await this.adminService.findAdminById(payload.sub);
+      if (!adminUser || adminUser.status !== 'active') {
+        throw new UnauthorizedException('Admin not authenticated');
+      }
+
+      request.adminUser = adminUser;
+      request.adminId = adminUser.id;
+      return true;
+    } catch {
+      throw new UnauthorizedException('Admin not authenticated');
+    }
+  }
+}