refactor: warehouse/tree 移除临时打点日志，保留 O(N) build_tree 优化

inventory-backend/app/api/v1/warehouse.py

@@ -36,33 +36,19 @@ def get_tree():
     """
     获取库位树形结构
     """
-    import time
-    from flask import current_app
-    t0 = time.time()
     try:
         # 查询所有库位，按 name 升序排序
         all_locations = SysWarehouseLocation.query.order_by(SysWarehouseLocation.name.asc()).all()
-        t1 = time.time()
 
-        # 构建树形结构
+        # 构建树形结构（O(N) 内存组装，见 build_tree）
         tree_data = build_tree(all_locations, parent_id=None)
-        t2 = time.time()
 
-        resp = jsonify({
+        return jsonify({
             'code': 200,
             'msg': 'success',
             'data': tree_data
         })
-        t3 = time.time()
-
-        print(
-            f"[warehouse/tree 打点] 阶段1-查库={t1 - t0:.3f}s | 阶段2-build_tree+to_dict={t2 - t1:.3f}s | "
-            f"阶段3-jsonify序列化={t3 - t2:.3f}s | 总={t3 - t0:.3f}s (rows={len(all_locations)}, tree_top={len(tree_data)})",
-            flush=True
-        )
-        return resp
     except Exception as e:
-        print(f"[warehouse/tree 打点] 异常: {e}", flush=True)
         return jsonify({
             'code': 500,
             'msg': str(e),