WeebCentral and MangaPill are off by default, with an admin switch per source

Both are unofficial sites that mostly host unlicensed copies; MangaDex (official
API) stays on. Settings → Admin → Scraper → Hoster settings has a 'Use <source>'
switch. A switched-off source refuses new jobs, keeps queued jobs waiting and is
skipped by nightly update checks. Installations whose queue or history already
used a source keep it switched on, so upgrades don't stop a working queue.

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

docs/scraper-service.md

@@ -205,7 +205,7 @@ All responses are JSON. When `SCRAPER_TOKEN` is set, send
 | `POST` | `/api/queue/clear-completed` | `{source?}`; remove inactive successful download job rows only; preserve library, history, checkpoints and other statuses |
 | `POST` | `/api/queue/reorder` | `{ids}` containing every queue id exactly once |
 | `POST` | `/api/control` | `{action:"pause"|"resume"|"retry"|"inspect"|"confirm"|"skip",id?}`; `pause-source`/`resume-source` use `id` as the source name and do not change the global pause |
-| `POST` | `/api/settings` | `sourceRates.{adapter}.{minMs,maxMs,chapterMinMs,chapterMaxMs}` plus `autoUpdateEnabled` and local `autoUpdateTime` (`HH:MM`) |
+| `POST` | `/api/settings` | `sourceRates.{adapter}.{minMs,maxMs,chapterMinMs,chapterMaxMs}`, `sourcesEnabled.{weebcentral,mangadex,mangapill}` (booleans; WeebCentral and MangaPill default to off, except on installations whose queue already used them; a switched-off source refuses new jobs, keeps queued ones waiting and is skipped by update checks), plus `autoUpdateEnabled` and local `autoUpdateTime` (`HH:MM`) |
 | `POST` | `/api/discovery/run` | Queue an immediate update check for every enabled manga |
 | `POST` | `/api/library/auto-update` | `{id,enabled}` updates `manga.json` atomically |
 | `POST` | `/api/legacy/publish-ready` | Paused-only validation/publication of completed legacy work; converts its checkpoint to incremental mode |