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>

app/services/nzb_service.ts

@@ -0,0 +1,35 @@
+import db from '@adonisjs/lucid/services/db'
+import { decodeChunk } from '#lib/chunks/index'
+import { buildNzb } from '#lib/nzb/index'
+
+/**
+ * A release's NZB (REBUILD.md, part 9), from its chunks in the chunk store:
+ * every chunk decoded, its files in name order. A file stored twice (the same
+ * name and first article, e.g. a range read again) is taken once.
+ */
+class NzbService {
+  async build(releaseId: number): Promise<{ name: string; xml: string } | null> {
+    const release = await db.from('releases').where('id', releaseId).select('name').first()
+    if (!release) return null
+    const chunks = await db.from('release_chunks').where('release_id', releaseId).orderBy('id').select('payload')
+    const files = new Map<string, ReturnType<typeof decodeChunk>[number]>()
+    for (const chunk of chunks) {
+      for (const file of decodeChunk(chunk.payload)) files.set(`${file.name}\n${file.segments[0]?.[1] ?? ''}`, file)
+    }
+    const xml = buildNzb(
+      [...files.values()]
+        .sort((a, b) => a.name.localeCompare(b.name))
+        .map((f) => ({
+          name: f.name,
+          poster: f.poster,
+          date: f.postedAt ?? 0,
+          groups: f.groups,
+          segments: f.segments.map(([number, id, size]) => ({ number, id, size })),
+        })),
+      { title: release.name }
+    )
+    return { name: release.name, xml }
+  }
+}
+
+export default new NzbService()