出库操作逻辑上面实现，成功跑通

inventory-backend/app/models/outbound.py

@@ -10,17 +10,17 @@ class TransOutbound(db.Model):
 
     # 关联源库存信息
     sku = db.Column(db.String(100))
-    source_table = db.Column(db.String(50))  # 'stock_buy', 'stock_product', etc.
+    source_table = db.Column(db.String(50))  # 'stock_buy', 'stock_product', 'stock_semi'
     stock_id = db.Column(db.Integer)  # 对应源表的主键ID
     barcode = db.Column(db.String(100))  # 实际扫码内容
 
     # 业务信息
-    outbound_type = db.Column(db.String(50), default='SALES')  # SALES, USE, TRANSFER
+    outbound_type = db.Column(db.String(50), default='SALES')  # SALES(销售), USE(领用), TRANSFER(调拨)
     quantity = db.Column(db.Numeric(19, 4), nullable=False)
 
     # 签字与追溯
     consumer_name = db.Column(db.String(100))  # 领用人/客户
-    signature_path = db.Column(db.Text)  # 签名图片路径
+    signature_path = db.Column(db.Text)  # 电子签名图片路径
     outbound_time = db.Column(db.DateTime, default=datetime.now)
     operator_name = db.Column(db.String(100))  # 操作员