nzbget, qbittorrent: full nox downloader modules (ADR 0044/0046)

nzbget (usenet, JSON-RPC) and qbittorrent (torrents, WebUI API with manual SID
session). Tools: status, queue/torrents, add, pause/resume, delete. Both poll
and emit module.<app>.download.added and module.<app>.download.completed — the
key plex consumes to rescan; completion is keyed off real success (nzbget
history SUCCESS, qbittorrent progress reaching 1), not mere queue disappearance,
so a failed or deleted item is not reported as done. Typecheck; manifests parse.

modules/qbittorrent/module.json

@@ -4,6 +4,14 @@
   "capabilities": [
     "container-runtime"
   ],
+  "emits": [
+    "module.qbittorrent.download.added",
+    "module.qbittorrent.download.completed"
+  ],
+  "consumes": [],
+  "own-secrets": {
+    "broker": "/var/lib/qbittorrent/broker"
+  },
   "listens": [
     {
       "port": 8080,