fix(force-recharge): 补充强充配置缺失的接口和数据库字段

- 订单管理：增加 payment_method 字段支持，合并代购订单逻辑
- 套餐系列分配：增加强充配置字段（enable_force_recharge、force_recharge_amount、force_recharge_trigger_type）
- 数据库迁移：添加 force_recharge_trigger_type 字段
- 测试：更新订单服务测试用例
- OpenSpec：归档 fix-force-recharge-missing-interfaces 变更

migrations/000037_add_force_recharge_trigger_type.down.sql

@@ -0,0 +1,3 @@
+-- 回滚: 删除强充触发类型字段
+
+ALTER TABLE tb_shop_series_allocation DROP COLUMN force_recharge_trigger_type;

migrations/000037_add_force_recharge_trigger_type.up.sql

@@ -0,0 +1,6 @@
+-- 为 tb_shop_series_allocation 表添加强充触发类型字段
+-- 补充强充配置完整性
+
+ALTER TABLE tb_shop_series_allocation ADD COLUMN force_recharge_trigger_type INT DEFAULT 2;
+
+COMMENT ON COLUMN tb_shop_series_allocation.force_recharge_trigger_type IS '强充触发类型(1:单次充值, 2:累计充值)';