test(gateway): 补上「钱路径」与租户隔离的回归测试 —— P0 最高优先级缺口

完成度审计(见记忆 completion-audit)最尖的一条:涉及钱的路径此前 0 测试,
支付一上线 bug=真实错账;租户数据层隔离也只测了角色门禁没测数据层真隔离。
把本会话 live 手验过的断言固化成回归测试。

测试基建:纯 Go sqlite(glebarez,无 CGO)内存库,迁同款模型+建部分唯一索引+
挂租户作用域回调,复用生产 store 方法测真逻辑。CI ubuntu 无 Postgres 也能跑
(此前 store 测试全是纯逻辑,DB 事务逻辑从没进过关卡)。

钱路径不变量(6):
- GrantCredits 记分录+增余额,余额恒等于 SUM(ledger)
- 兑换码核销一次性(CAS)+原子入账,重复核销余额纹丝不动
- 账本(kind,ref)部分唯一索引:重复 grant 被兜底拦下、usage 不受约束
- MarkOrderPaid CAS 幂等:重复回调 changed=false 不重复入账
- SaveUsageEvent task_id 幂等:同任务重投不重复扣费
- ReconcileOrders 抓出 order_without_ledger(钱到了积分没给)

租户隔离(3):创建自动填 tenant_id、查询按 ctx 租户过滤、跨租户改/删命不中、
WithoutTenant 系统视角全可见。

go build/vet + 全 gateway 测试全绿;sqlite 仅测试引用,不进生产二进制。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-gateway/go.sum

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