Complete archive listings by walking RAR headers, at low priority

Inspection lists only the entries whose headers are in the first segment
of a first volume. A walk hops from header to header, fetching one segment
per entry and volume, in its own queue (one job per collection worker) on
NNTP connections inspection isn't waiting for. content:walk-archives queues
releases inspected earlier (CONCEPT D40).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/services/ContentService.ts

@@ -25,6 +25,7 @@ import { looksLikeFilename } from '#lib/subject/index'
 import { sevenZipVolume } from '#lib/sevenzip/index'
 import SevenZipService from '#services/SevenZipService'
 import SfvService from '#services/SfvService'
+import ArchiveWalkService from '#services/ArchiveWalkService'
 import { segmentsOf } from '#services/FileStore'
 
 const FIRST_CHUNK = 16 * 1024
@@ -259,6 +260,8 @@ class ContentService {
       const info = parseRarHeaders(segment.data)
       if (info) {
         result.archive = await ArchiveService.record(file, binary, info)
+        // The rest of the listing, later and at low priority (D40).
+        await ArchiveWalkService.queueAfterInspection(result.archive.releaseId ?? null, info)
         if (hasNzbEntries(info)) result.archiveNzbs = await this.importArchiveNzbs(file, segment.data)
       }
     }