feat(library): download history lists adopted tasks and organize records

- Migration 0053: download_task.media_entity_id (FK, set null on delete),
  backfilled from plan slot / source release / latest organize record.
- Submitted and adopted tasks carry the entity; entity merge follows it.
- GET /library/{id}: downloads also matched by dt.media_entity_id (adopted
  takeover tasks), plus organizationRecords (incl. manual path organizes);
  library list / inventory counts use it too.
- Web detail: "接管" marker and a list of records without a download task.

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

packages/contracts/src/organization.ts

@@ -374,6 +374,27 @@ export const LibraryDetail = z.object({
   slots: z.array(AcquisitionSlot),
   candidates: z.array(CandidateEvaluation),
   downloads: z.array(LibraryDownloadView),
+  /**
+   * 该作品的整理记录(最近 100 条,新→旧):含没有下载任务的手动整理(文件管理按路径整理)。
+   * 下载历史里已按下载任务列出的记录也在这里,前端按 downloadTaskId 去重展示。
+   */
+  organizationRecords: z
+    .array(
+      z.object({
+        id: Id,
+        status: OrganizationStatus,
+        action: OrganizationAction,
+        trigger: OrganizationTrigger,
+        downloadTaskId: Id.nullable(),
+        sourcePath: z.string().nullable(),
+        targetPath: z.string().nullable(),
+        fileSucceeded: NonNegInt,
+        fileTotal: NonNegInt,
+        createdAt: Timestamp,
+        finishedAt: Timestamp.nullable(),
+      }),
+    )
+    .optional(),
 });
 export type LibraryDetail = z.infer<typeof LibraryDetail>;