Inspect fewer files: skip later volumes under random stems

Of 5,000 waiting inspection jobs, 3,212 were queued only because their
stem looked random, and 2,044 of those were later RAR volumes
(xyz.part47.rar, .r00) or par2 recovery volumes (.vol03+04.par2). Their
first segment adds nothing: the set is listed from its first volume and
named from its index .par2, as for readable names already. Each one cost a
~700 KB download; inspection pulled ~85 MB/s and fell behind the backfill.

- isCandidate() rejects later volumes (isLaterVolume) before the random-
  name rule.
- worker:file only queues files that are candidates, so the ~30% that
  inspection skips anyway no longer take queue slots.

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

lib/content/archive_names.ts

@@ -11,3 +11,15 @@ export function isArchiveStart(name: string): boolean {
   if (volume === 0 || volume === 1) return true
   return /\.part0*1\.rar$/i.test(name) || (/\.rar$/i.test(name) && !/\.part\d+\.rar$/i.test(name))
 }
+
+/**
+ * A later RAR volume (.part02.rar, .r00) or a par2 recovery volume
+ * (.vol03+04.par2): the volume number is readable even under a random stem.
+ * The set is listed from its first volume and named from its index .par2,
+ * so the first segment of these says nothing new (LOG.md 2026-10-04).
+ */
+export function isLaterVolume(name: string): boolean {
+  const part = /\.part(\d+)\.rar$/i.exec(name)
+  if (part) return Number(part[1]) > 1
+  return /\.r\d{2,3}$/i.test(name) || /\.vol\d+[+-]\d+\.par2$/i.test(name)
+}

lib/content/index.ts

@@ -2,6 +2,6 @@
  * Content recognition by magic bytes, independent of AdonisJS.
  */
 export { sniffContentType, type ContentType } from './sniff.js'
-export { isArchiveStart } from './archive_names.js'
+export { isArchiveStart, isLaterVolume } from './archive_names.js'
 export { parseSfv, sfvReleaseName, type SfvEntry } from './sfv.js'
 export { NICOVIDEO_FILE, NICOVIDEO_RELEASE, nicovideoInfo, nicovideoReleaseName, zstdPrefix, tarEntries, type NicovideoInfo } from './nicovideo.js'