feat(box): simplify boxing mode API

app/schemas/box.py

@@ -44,7 +44,6 @@ class BoxSaveRequest(BaseModel):
     zongpai_no: str
     box_no: int
     quantity: int
-    box_mode: str | None = None  # one-to-one | one-to-many | many-to-one
 
     @field_validator("zongpai_no")
     @classmethod
@@ -83,7 +82,6 @@ class BoxUpdateRequest(BaseModel):
     """PATCH /box/{box_item_id} 请求"""
     box_no: int
     quantity: int
-    box_mode: str = "one-to-many"
 
     @field_validator("box_no")
     @classmethod