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>

package.json

@@ -68,7 +68,8 @@
     "@vinejs/vine": "^4.4.0",
     "luxon": "^3.7.2",
     "pg": "^8.23.1",
-    "reflect-metadata": "^0.2.2"
+    "reflect-metadata": "^0.2.2",
+    "xmlbuilder2": "^4.0.3"
   },
   "hotHook": {
     "boundaries": [