k88936
09ea0a5e76
新增external_generation_job的provider任务checkpoint
- provider_kind 与 provider_task_id 追加在表末尾，带显式默认值，旧行迁移时补 NULL
- 新增 set_external_generation_job_provider_checkpoint_and_return procedure，复用 running 租约栅栏
- 已有 checkpoint 时禁止覆盖并留下 provider_checkpoint 事件，作为 at-most-once submit 的数据层保证
- 快照与兼容快照同步投影两个新字段，轻量摘要按无 checkpoint 返回
- 增加 checkpoint 不可覆盖的不变量单测
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