feat(hosts): add transmission torrent client

Enables the Transmission daemon + web UI on arrakis, konishi, and yolo.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

hosts/arrakis/default.nix

@@ -22,6 +22,7 @@
     ../common/features/bluetooth.nix
     ../common/features/ledger.nix
     ../common/features/smb-mounts.nix
+    ../common/features/transmission.nix
     ../common/features/home
   ];
 

hosts/common/features/transmission.nix

@@ -0,0 +1,15 @@
+{ pkgs, ... }:
+{
+  services.transmission = {
+    enable = true;
+    package = pkgs.transmission_4;
+    openRPCPort = true;
+    settings = {
+      rpc-bind-address = "0.0.0.0";
+      rpc-whitelist-enabled = false;
+      rpc-host-whitelist-enabled = false;
+      rpc-authentication-required = false;
+      download-dir = "/var/lib/transmission/Downloads";
+    };
+  };
+}

hosts/konishi/default.nix

@@ -22,6 +22,7 @@
     ../common/features/appimage.nix
     ../common/features/flatpak.nix
     ../common/features/smb-mounts.nix
+    ../common/features/transmission.nix
     ../common/features/home
   ];
 

hosts/yolo/default.nix

@@ -17,6 +17,7 @@
     ../common/features/kdeconnect.nix
     ../common/features/nix-ld.nix
     ../common/features/appimage.nix
+    ../common/features/transmission.nix
     ../common/features/home
   ];