Fix report draft save and microphone startup

- Allow draft reports to be saved without patient name or hospital ID while keeping completed reports strictly validated.

- Preserve completed-report identity validation when updating existing reports by checking merged old and new values.

- Show real API save errors in the report editor and send expired sessions back to login instead of reporting a generic backend outage.

- Guard speech startup for missing getUserMedia or AudioContext support and explain localhost/HTTPS microphone requirements.

- Add report schema tests covering draft identity fields and completed-report validation.

- Update AGENTS and docs for report editor behavior, feature status, progress, and testing coverage.

AGENTS.md

@@ -343,6 +343,7 @@ PostgreSQL 数据模型。当前覆盖 `Tenant`、`Department`、`User`、`UserS
 - 后端权限策略覆盖报告、模板、用户管理和管理员创建规则
 - 后端 Dashboard 统计按角色范围过滤
 - 后端报告 metadata 兼容映射和 `ReportMedia` 视频/关键帧组装
+- 后端报告 schema 区分草稿和完成状态，草稿可暂缺患者姓名/住院号，完成报告必须填写
 - 后端模板 DTO 和权限资源映射
 - 后端用户 DTO 和部门模板授权映射
 - 后端系统设置 schema 校验