API Changelog Bot和Claude Opus 5
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docs(changelog): #7980 价格日历四个写接口补齐真实并发互斥 + 新增可重试冲突码 100503
hl-fleet-service 车型价格日历四个写口（批量设价 / 多车型批量设价 / 批量改状态 / 清除价格日历）
此前虽各自写了相同的 @Lock4j keys，但都没写 name；lock4j 落 Redis 的锁键含方法名，
name 缺省时退化成「类全限定名 + 方法名」，四处因此各自持有一把互不相干的锁——
接口文档里一直写着的「四个价格写端点全互斥」此前并不成立。本次补上同一个显式 name，互斥才真正生效。
接口路径、方法、请求/响应字段、既有 4 个业务错误码（600500-600503）均零增删。
唯一的契约变化是新增一条可能返回的错误码 100503（RESOURCE_LOCKED，「资源被占用,请稍后重试」），
且它以 HTTP 200 + body code 的形式返回——前端只看 HTTP 状态码会把它当成功。
关于 100503 的触发频率，正文两面都写，缺一面都会误导前端：
- 该路径源码级真实存在（acquireTimeout 默认 3000ms + LockFailureExceptionHandler 转 100503
+ @ResponseStatus(HttpStatus.OK)，三处均已读码确认）；
- 但测试服用 4/8/17/34 并发 × 365 天多轮尝试均返回 200，一次未触发（推断原因：本次优化后
单车型 366 天的 DB 往返从 732 次降到个位数，临界区极短，累计排队远小于 3 秒）。
⇒ 前端仍应防御性处理并允许重试，但不必按高频路径设计交互；
同时不能因为测试服没测到就当它不会发生——更长事务 / 更大载荷 / 生产数据量下的行为未知。
测试服证据（backend_status 因此才从 pending 转为 deployed，此前门禁 E_BACKEND_PENDING 正确拦下过一次）：
部署前 53c2ff2d1 → 部署后 10efbaddf，merge-base --is-ancestor ee1937950 10efbaddf 返回 ANCESTOR_YES；
redis-cli MONITOR 实时抓包证实 12 并发只命中同一把锁键
lock4j:fleet:pricing-calendar:write#fleet:pricing-calendar:write，改前那种含方法名的坏形态一次未现，
12 组干净的 acquire→release、未观察到两个持有者同时持锁；71 次回归调用全部 code=200。
测试数据写在原本全空的未来年份（2027 部分/2028/2031/2032/2033，71 组车型×年份），
已用 71 次 DELETE 逐一还原并按年复核归零，真实业务数据（2026-09 丰田普拉多 24 条）抽查与改前一致。
gateway_status 记 not_required：四端点路径/方法零变化、hl-gateway 版本未动（4cbccc26b），
是判定不是漏验证，判据已写进 status_note。
Refs #7980
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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