feat(files): W5-A2 move/copy via planImport, organize overrides, delete records, download

- /files/move|copy go through planImport's new `transfer` variant (keep names, directory
  expanded to per-file plan) → organization_record + verifyAndImport/executeRecord: per-file
  ledger resumable, fsproxy, cross-volume directory move = per-file copy→verify→delete then
  remove empty source dirs; shared plan store + plan_stale; asset_location follows per file,
  path_binding revised when a whole directory moved (finalizeTransfer); request waits up to
  FILES_TRANSFER_WAIT_SEC, else executed.pending
- /files/organize per-item overrides take effect: season/episodes (domain planOrganize
  overrides), contentUnitId coverage, targetDir (no binding), operation, slotId (satisfied
  after verify); warnings only for inapplicable overrides
- delete/trash/restore write organization_record (action trash|delete|restore, file-level
  results; migration 0026)
- GET /files/download (admin session, nfo/subtitle/image, size cap, streamed, audited)
- GET /files/records?ids|planIds for the organize page
- fs race errors map to 503/404/403/400 instead of 500
- runbook updated

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/mapping/src/organize.ts

@@ -29,6 +29,10 @@ const ACTION_BACK: Record<OrganizationAction, OrganizeOperation | null> = {
   // domain 不生成目录调整/硬链接计划
   relocate: null,
   hardlink: null,
+  // 文件管理的删除/还原记录不对应整理计划
+  trash: null,
+  delete: null,
+  restore: null,
 };
 export const DOMAIN_ORGANIZE_OPERATIONS = Object.keys(OPERATION) as OrganizeOperation[];