Clean up networking configuration structure

- Remove leftover networking.nix files from machine directories
- ZFS configuration moved to machine-specific configuration where it belongs
- Network module now contains only networking-related configuration
- Improved separation of concerns between network and machine configs

machines/congenital-optimist/configuration.nix

@@ -47,7 +47,11 @@
       }
     ];
   };
-
+# ZFS services for this machine
+  services.zfs = {
+    autoScrub.enable = true;
+    trim.enable = true;
+  };
   # Basic system configuration
   nixpkgs.config.allowUnfree = true;
   system.stateVersion = "23.11"; # DO NOT CHANGE - maintains data compatibility

machines/congenital-optimist/networking.nix

@@ -1,33 +0,0 @@
-# Networking Configuration - congenital-optimist
-# AMD Threadripper workstation network setup
-{ config, pkgs, ... }:
-
-{
-  # Network configuration
-  networking = {
-    hostName = "congenital-optimist";
-    hostId = "8425e349";
-    networkmanager.enable = true;
-    nftables.enable = true;
-    
-    # Firewall configuration for workstation
-    firewall = {
-      enable = true;
-      allowedTCPPorts = [ 
-        22    # SSH
-        9091  # Transmission RPC
-      ];
-      allowedUDPPorts = [ 22 ];
-    };
-  };
-
-  # VPN and remote access
-  services.tailscale.enable = true;
-  services.openssh.enable = true;
-
-  # ZFS services for this machine
-  services.zfs = {
-    autoScrub.enable = true;
-    trim.enable = true;
-  };
-}