refactor：重构安全模块架构，将security模块迁移至core层

- 将src/business/security模块迁移至src/core/security_core
- 更新模块导入路径和依赖关系
- 统一安全相关组件的命名规范（content_type.middleware.ts）
- 清理过时的配置文件和文档
- 更新架构文档以反映新的模块结构

此次重构符合业务功能模块化架构设计原则，将技术基础设施
服务统一放置在core层，提高代码组织的清晰度和可维护性。

src/business/user-mgmt/controllers/user-status.controller.ts

@@ -20,8 +20,8 @@ import { Body, Controller, Get, HttpCode, HttpStatus, Param, Put, Post, UseGuard
 import { ApiBearerAuth, ApiBody, ApiOperation, ApiParam, ApiResponse, ApiTags } from '@nestjs/swagger';
 import { AdminGuard } from '../../admin/guards/admin.guard';
 import { UserManagementService } from '../services/user-management.service';
-import { Throttle, ThrottlePresets } from '../../security/decorators/throttle.decorator';
-import { Timeout, TimeoutPresets } from '../../security/decorators/timeout.decorator';
+import { Throttle, ThrottlePresets } from '../../../core/security_core/decorators/throttle.decorator';
+import { Timeout, TimeoutPresets } from '../../../core/security_core/decorators/timeout.decorator';
 import { UserStatusDto, BatchUserStatusDto } from '../dto/user-status.dto';
 import { UserStatusResponseDto, BatchUserStatusResponseDto, UserStatusStatsResponseDto } from '../dto/user-status-response.dto';