功能：新增托盘二维码与用户分配

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

@@ -389,3 +389,19 @@ class UserAssignModel(BaseModel):
     user_ids: list[PositiveId] = Field(min_length=1, description='用户ID列表')
 
     _validate_unique_ids = field_validator('user_ids')(_ensure_unique_ids)
+
+
+class BusinessUserOptionModel(BaseModel):
+    """仓库或客户现场可分配用户的最小只读模型。"""
+
+    model_config = ConfigDict(
+        alias_generator=to_camel,
+        from_attributes=True,
+        populate_by_name=True,
+        extra='forbid',
+    )
+
+    user_id: PositiveId = Field(description='用户ID')
+    user_name: str = Field(min_length=1, max_length=30, pattern=r'\S', description='用户账号')
+    nick_name: str | None = Field(default=None, max_length=30, description='用户昵称')
+    assigned: bool = Field(description='是否已分配')