fix(download): 下载器离线与下载目录读不到容量开待处理，季包暂停添加后选文件

- M5:单个下载器连续 10 分钟连不上开 downloader_offline(按实例去重),恢复连接后自动关闭
- M3:下载目录读不到容量按卷开 critical 的 cache_volume_unknown,读到后关闭;面板单独显示
  「下载目录读不到」不再归为等空间;cache.threshold 不再把未知当 0%
- M4:季包 / 多集包 .torrent 暂停添加、磁力用「拿到元数据后停止」,选完文件再恢复;文件清单
  拿不到时留给同步重试,超过 10 分钟整包下载并记 file_list_timeout
- L1:提交 commit 时锁计划复核仍是 reserved,被取消的不写回 submitted,qB 里刚加的任务暂停、
  去掉管理标签并打 <管理标签>-cancelled
- L3:已收单未确认的提交在同步首次看到任务时补调 afterDownloadAccepted
- L4:排队中(queuedDL)的纳管任务一并受阈值暂停
- L6:停用的下载器上还有在下的任务时仍同步这些任务(不接管新任务、不开离线事项)

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

apps/web/app/components/downloads/plan-format.ts

@@ -10,6 +10,7 @@ export const PURPOSE_LABEL: Record<PlanPurpose, string> = { fill: "补缺", upgr
 export const PLAN_WAIT: Record<PlanWait, { label: string; tone: "warning" | "neutral" }> = {
   approval: { label: "等你批准", tone: "warning" },
   space: { label: "等磁盘空间", tone: "warning" },
+  volume_unknown: { label: "下载目录读不到", tone: "warning" },
   automation_off: { label: "等开启自动化", tone: "warning" },
   queued: { label: "准备提交", tone: "neutral" },
 };