Keep binaries until inspected; seeding writes binaries only for inspection

Par2 naming needs the fingerprint inspection stores on a binary, and the
GC deleted seeded binaries (6 h unfingerprinted, 48 h stale) long before
the inspection queue reached them. binaries.awaiting_inspection protects
them for up to 7 days; the GC deletes use partial indexes so they don't
read past waiting rows. Seeding no longer creates binaries for files that
aren't inspected (~85% of a.b.ath), which only churned the table.

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

app/services/ContentService.ts

@@ -165,6 +165,8 @@ class ContentService {
         .update({
           size: db.raw('coalesce(size, ?)', [probe.size]),
           md5_16k: db.raw('coalesce(md5_16k, ?)', [probe.md5_16k]),
+          // Inspected: the GC may delete it again by its usual rules (LOG.md 2026-10-06 (11)).
+          awaiting_inspection: null,
         })
     }