Spotnet import, header backfill, staging and counter grouping, faster search

Spotnet (CONCEPT D29):
- Index free.pt fully and import spots with their descriptions, categories
  and NZBs; a spot renames its release, since Spotnet names are more
  trustworthy than names derived from subjects.
- Find passwords in spot descriptions too, and tell "needs a password we
  have" from "needs a password we don't have".

Content inspection:
- List the contents of 7z (.7z.001) archives, SFV sets, nicovideo uploads
  and other archive-like files; mark yEncBin .bin containers as encrypted.
- Take real names from yEnc headers for randomly named files, and merge
  uploads that were split across posts.

Storage (D31, D32):
- Store segment lists zstd-compressed behind the FileStore accessor.
- group:backfill indexes older headers at low priority and pauses when
  the NVMe or HDD part of the database gets too large.

Grouping (D35, D36):
- Lone header segments wait in staged_segments until a second segment of
  their file arrives, which drops the per-article junk binaries.
- Counter grouping joins random-subject uploads by poster, [i/M] counter,
  part count and day.

Search and maintenance (D33, D34):
- A trigram-indexed search_text column, smaller indexes, estimated stats.
- Passes that clean up nonsense names; weekly index maintenance; GC budgets
  per kind.
- Web UI: grey out stale results while a search runs and cancel superseded
  requests. Count only up to 1,000 matches for the page, which made filter
  clicks take seconds (Newznab keeps the 10,000 cap).

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

tests/functional/newznab.spec.ts

@@ -1,5 +1,6 @@
 import { test } from '@japa/runner'
 import db from '@adonisjs/lucid/services/db'
+import FileStore from '#services/FileStore'
 import env from '#start/env'
 import testUtils from '@adonisjs/core/services/test_utils'
 
@@ -11,11 +12,11 @@ async function seed(name: string, opts: { fileTotal?: number; files?: number } =
     .insert({ release_key: `nz${++counter}`.padEnd(40, 'n'), name, source: 'stem', poster: 'poster@example.invalid', groups: '["alt.binaries.test"]', file_total: opts.fileTotal ?? null, posted_at: now, first_seen_at: now, last_seen_at: now })
     .returning('id')
   for (let i = 0; i < (opts.files ?? 1); i++) {
-    await db.table('files').insert({
+    await FileStore.insert([{
       filename: `${name}.part${i + 1}.rar`, poster: 'poster@example.invalid', date: now.getTime(), parts: 1, size: 1_000_000,
-      release_id: release.id, groups: '["alt.binaries.test"]', message_ids: JSON.stringify({ '1': { id: `${name}-${i}@test`, size: 1_000_000 } }),
+      release_id: release.id, groups: '["alt.binaries.test"]', segments: [{ number: 1, id: `${name}-${i}@test`, size: 1_000_000 }],
       created_at: now, updated_at: now,
-    })
+    }])
   }
   return Number(release.id)
 }