Add private BitTorrent tracker for Jirorian-whitelisted users

Pure Python HTTP tracker with NIP-98 passkey retrieval, HMAC passkeys,
and info_hash validation against NIP-35 kind:2003 relay events.
Relay allowlist extended with kinds 5, 2003, 2004.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

flake.nix

@@ -57,6 +57,7 @@
           ./modules/services/webhook-deploy.nix
           ./modules/services/jirorian.nix
           ./modules/services/nip05.nix
+          ./modules/services/torrent-tracker.nix
           ./modules/users/tobias.nix
         ];
       };