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- Web UI: grey out stale results while a search runs and cancel superseded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/names.spec.ts

@@ -1,5 +1,6 @@
 import { test } from '@japa/runner'
 import db from '@adonisjs/lucid/services/db'
+import FileStore from '#services/FileStore'
 import testUtils from '@adonisjs/core/services/test_utils'
 import NameService from '#services/NameService'
 
@@ -36,10 +37,9 @@ test.group('NameService', (group) => {
       .table('releases')
       .insert({ release_key: 'w'.repeat(40), name: 'mOzyyxCyYUjAbCdEf12', source: 'stem', groups: '[]', first_seen_at: now, last_seen_at: now })
       .returning('id')
-    const [file] = await db
-      .table('files')
-      .insert({ filename: 'mOzyyxCyYUjAbCdEf12', poster: 'x', date: now.getTime(), parts: 1, size: 1, groups: '[]', message_ids: '{}', release_id: weak.id, created_at: now, updated_at: now })
-      .returning('id')
+    const [file] = await FileStore.insert([
+      { filename: 'mOzyyxCyYUjAbCdEf12', poster: 'x', date: now.getTime(), parts: 1, size: 1, groups: '[]', segments: [], release_id: weak.id, created_at: now, updated_at: now },
+    ])
     const episode = await binary('ep18', { size: 939_684_767, md5_16k: 'd'.repeat(32), release_id: weak.id, file_id: file.id })
 
     await NameService.resolve([episode])