Rebuild: NZBs from the chunk store, and a catalog search

lib/nzb (buildNzb, parseNzb) from the current app; NzbService builds a
release's NZB from its chunks; GET /api/v1/releases?q= (every word of the
name) and GET /api/v1/releases/:id/nzb behind the api guard. A test stores
a batch, finds the release and reads its NZB back.

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

start/routes.ts

@@ -34,6 +34,14 @@ router
       .as('profile')
       .use(middleware.auth())
 
+    // The catalog (REBUILD.md, part 9).
+    router
+      .group(() => {
+        router.get('releases', [controllers.Releases, 'index'])
+        router.get('releases/:id/nzb', [controllers.Releases, 'nzb'])
+      })
+      .use(middleware.auth({ guards: ['api'] }))
+
     // Edge workers (REBUILD.md, parts 1–2).
     router
       .group(() => {