copy(contracts): 设置校验、事件说明与 API 摘要统一术语

恢复水位 / 硬阈值 → 恢复线 / 暂停线;库根、哨兵、Feed、快照、建档、纳管等按术语表改。

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cxwgnn2pbzQ7rXv3rq7fei

packages/contracts/src/reasons.ts

@@ -38,7 +38,7 @@ const REASONS: Record<string, ReasonText> = {
   entity_not_found: { text: "作品已不存在" },
   no_library_root: { text: "没有可用的媒体库目录", action: "在设置 → 媒体库与目录里添加" },
   library_root_offline: { text: "媒体库目录不可访问或未挂载", action: "检查挂载后重试" },
-  target_dir_unavailable: { text: "整理目标目录建不出来", action: "检查目录权限或挂载，恢复后自动重试" },
+  target_dir_unavailable: { text: "无法创建整理目标目录", action: "检查目录权限或挂载，恢复后自动重试" },
   organize_stalled: { text: "整理多次重试仍未完成", action: "检查后重新整理" },
   excluded_unresolved: { text: "有视频没能确定季集或目标目录，留在原处", action: "确认季集后重新整理" },
   target_dir_outside_root: { text: "目标目录不在媒体库目录里" },