```

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/schemas.py

@@ -1,26 +1,6 @@
 from typing import Any
 
-from pydantic import BaseModel, Field
-
-from app.core.constants import ActorValue
-
-
-class DomainRecordCreate(BaseModel):
-    data: dict[str, Any] = Field(..., description="Domain fields to create.")
-    actor: str = ActorValue.API
-    approval_ticket_id: str | None = Field(
-        default=None,
-        description="Required by policy for business record creates.",
-    )
-
-
-class DomainRecordUpdate(BaseModel):
-    data: dict[str, Any] = Field(..., description="Domain fields to update.")
-    actor: str = ActorValue.API
-    approval_ticket_id: str | None = Field(
-        default=None,
-        description="Required by policy for business record updates.",
-    )
+from pydantic import BaseModel
 
 
 class DomainRecordRead(BaseModel):