feat: DAMA数据治理规则检查（财务七规则）— 后端/check-governance + 前端数据质量中心升级

后端 backend/app/api/data_quality.py:
- 新增 GET /api/cma/data-quality/check-governance?entity_id= 端点
- 7条规则: unit_check单位校验/dup_alert重复预警/orphan_check孤儿预警/virtual_pollution虚拟污染/entity_check实体归属/kpi_completeness KPI完整性/reconciliation勾稽验证
- 质量评分: error扣10/warning扣5, 每条规则最多扣一次, 最低0分
- 兼容实体筛选(0全部/1酣客/2博海), 向后兼容既有/check端点

前端 frontend/src/api/index.ts + views/DataQuality.vue:
- dataQualityApi.checkGovernance() 新增
- 页面新增治理规则区: 质量评分仪表盘 + 7规则红黄绿状态表 + 异常明细展开 + 重新检查按钮 + 实体筛选

frontend/src/api/index.ts

@@ -344,6 +344,8 @@ export const dataQualityApi = {
   logs: (params?: any) => api.get('/data-quality/logs', { params }),
   updateLog: (id: number, data: any) => api.put(`/data-quality/logs/${id}`, data),
   deleteLog: (id: number) => api.delete(`/data-quality/logs/${id}`),
+  // DAMA数据治理规则检查（财务七规则）
+  checkGovernance: (params?: any) => api.get('/data-quality/check-governance', { params }),
 }
 
 export const biReportApi = {