feat: 完成sys模块迁移，对齐PHP/Java框架

- 重构sys模块架构，严格按admin/api/core分层
- 对齐所有sys实体与数据库表结构
- 实现完整的adminapi控制器，匹配PHP/Java契约
- 修复依赖注入问题，确保服务正确注册
- 添加自动迁移工具和契约验证
- 完善多租户支持和审计功能
- 统一命名规范，与PHP业务逻辑保持一致

wwjcloud/src/common/sys/services/admin/sysAgreement.service.ts

@@ -0,0 +1,43 @@
+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { SysAgreement } from '../../entity/sysAgreement.entity';
+
+@Injectable()
+export class SysAgreementService {
+  constructor(
+    @InjectRepository(SysAgreement)
+    private readonly repo: Repository<SysAgreement>,
+  ) {}
+
+  async getList() {
+    return this.repo.find({
+      order: { create_time: 'DESC' },
+    });
+  }
+
+  async getAgreement(key: string) {
+    return this.repo.findOne({ where: { agreement_key: key } });
+  }
+
+  async setAgreement(key: string, title: string, content: string) {
+    const existing = await this.repo.findOne({ where: { agreement_key: key } });
+    
+    if (existing) {
+      await this.repo.update(existing.id, {
+        title,
+        content,
+        update_time: Math.floor(Date.now() / 1000),
+      });
+    } else {
+      const agreement = this.repo.create({
+        agreement_key: key,
+        title,
+        content,
+        create_time: Math.floor(Date.now() / 1000),
+        update_time: Math.floor(Date.now() / 1000),
+      });
+      await this.repo.save(agreement);
+    }
+  }
+}