参照 llmage/product_interface.py 范式: - load_product_category_product(): 返回类别+产品标准数据,供产品导入 - get_product_display/check_product_availability/check_product_consumable /execute_product_service/execute_product_service_stream/calculate_product_cost - load_xxx() 设置 env.product_interface - calculate_product_cost 按 charge_mode/meter_mode 解析 ppid → buffered_charging 计费 - 延迟导入避免与 init 循环 import
storage_resource
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