fix: sort warehouse tree by name, fix tree batch delete cascade, and implement safe history location autofill

inventory-backend/app/api/v1/inbound/buy.py

@@ -390,3 +390,21 @@ def get_location_suggestions():
         return jsonify({"code": 400, "msg": "base_id required"}), 400
     data = BuyInboundService.get_history_locations(base_id)
     return jsonify({"code": 200, "msg": "success", "data": data})
+
+
+# ------------------------------------------------------------------
+# 11. 获取最近一次入库的库位（跨表查询）
+# ------------------------------------------------------------------
+@inbound_buy_bp.route('/last-location', methods=['GET'])
+@permission_required('inbound_buy')
+def get_last_location():
+    """
+    获取指定物料最近一次入库的库位
+    查询顺序：采购入库 -> 成品入库 -> 半成品入库，返回最新入库的库位
+    """
+    base_id = request.args.get('base_id', type=int)
+    if not base_id:
+        return jsonify({"code": 400, "msg": "base_id required"}), 400
+
+    location = BuyInboundService.get_last_location_by_base_id(base_id)
+    return jsonify({"code": 200, "msg": "success", "data": {"location": location}})