修复：返回使用后的余量与状态

shierfeng-fastapi-backend/module_business/entity/vo/operation_vo.py

@@ -154,6 +154,16 @@ class UsageCreateModel(BaseModel):
     idempotency_key: str = Field(min_length=1, max_length=64, pattern=r'\S', description='幂等键')
 
 
+class UsageSuccessResponseModel(BaseModel):
+    """客户现场使用成功响应模型。"""
+
+    model_config = ConfigDict(alias_generator=to_camel, from_attributes=True, populate_by_name=True)
+
+    usage_id: int = Field(gt=0, description='使用记录ID')
+    remaining_packages: int = Field(strict=True, ge=0, description='使用后剩余包数')
+    flow_state: PalletFlowState = Field(description='使用后托盘流转状态')
+
+
 class ReturnRequestModel(BaseModel):
     """托盘退回申请命令模型。"""