feat(task1): restructure directories for turborepo monorepo

- Move backend/ to apps/server/ via git mv
- Move frontend/ to apps/admin/ via git mv
- Create packages/typescript-config/ with base, nestjs, and react-vite presets

apps/server/src/operation-logs/operation-logs.service.ts

@@ -0,0 +1,48 @@
+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { OperationLog } from '../entities/operation-log.entity';
+
+@Injectable()
+export class OperationLogsService {
+  constructor(
+    @InjectRepository(OperationLog) private repo: Repository<OperationLog>,
+  ) {}
+
+  async log(params: {
+    userId?: number;
+    username?: string;
+    module: string;
+    action: string;
+    targetId?: number;
+    targetType?: string;
+    detail?: string;
+    ipAddress?: string;
+    userAgent?: string;
+    status?: string;
+  }) {
+    const entry = this.repo.create(params);
+    return this.repo.save(entry);
+  }
+
+  async findAll(query?: {
+    module?: string;
+    userId?: number;
+    startDate?: string;
+    endDate?: string;
+    page?: number;
+    pageSize?: number;
+  }) {
+    const qb = this.repo.createQueryBuilder('log')
+      .orderBy('log.createdAt', 'DESC');
+    if (query?.module) qb.andWhere('log.module = :module', { module: query.module });
+    if (query?.userId) qb.andWhere('log.userId = :userId', { userId: query.userId });
+    if (query?.startDate) qb.andWhere('log.createdAt >= :startDate', { startDate: query.startDate });
+    if (query?.endDate) qb.andWhere('log.createdAt <= :endDate', { endDate: query.endDate + ' 23:59:59' });
+
+    const page = query?.page || 1;
+    const pageSize = query?.pageSize || 50;
+    const [data, total] = await qb.skip((page - 1) * pageSize).take(pageSize).getManyAndCount();
+    return { data, total, page, pageSize };
+  }
+}