add audiobook-search service to servarr stack

- New audiobook-search deployment + service + ingress (Authentik-protected)
- qBittorrent: add NFS mount for /audiobooks (shared with Audiobookshelf)
- Cloudflare DNS: add audiobook-search.viktorbarzin.me
- Env vars: QBITTORRENT_URL/PASS, AUDIOBOOKSHELF_URL/TOKEN from ESO

stacks/servarr/main.tf

@@ -114,3 +114,11 @@ module "aiostreams" {
   tier                                  = local.tiers.aux
   nfs_server                            = var.nfs_server
 }
+
+module "audiobook_search" {
+  source               = "./audiobook-search"
+  tls_secret_name      = var.tls_secret_name
+  tier                 = local.tiers.aux
+  audiobookshelf_token = data.kubernetes_secret.eso_secrets.data["audiobookshelf_api_token"]
+  qbittorrent_password = data.kubernetes_secret.eso_secrets.data["qbittorrent_password"]
+}