```

refactor: 移除审批和回写功能模块

移除了整个审批(approvals)和官方回写(writebacks)功能模块，
包括相关模型、路由、服务和配置项。更新了数据库迁移文件，
删除了相关的审批请求表和官方回写运行表。同时从API路由器中
移除了相应的路由，并调整了安全常量和字段验证器以匹配变更。
```

app/modules/business/constants.py

@@ -86,11 +86,6 @@ class BusinessResponseKey(StrEnum):
     DATA = "data"
 
 
-class BusinessPayloadKey(StrEnum):
-    DATA = "data"
-    APPROVAL_TICKET_ID = "approval_ticket_id"
-
-
 class BusinessField(StrEnum):
     ID = "id"
     STATUS = "status"
@@ -98,7 +93,6 @@ class BusinessField(StrEnum):
 
 class BusinessErrorDetail(StrEnum):
     RECORD_NOT_FOUND = "Record not found"
-    HIGH_RISK_APPROVAL_REQUIRED = "High-risk domain change requires approval_ticket_id"
 
 
 UNKNOWN_FIELD_TEMPLATE = "Unknown field '{field}'"