refactor: Apply syntactic updates for NixOS best practices

This commit applies comprehensive syntactic improvements across the
repository to conform to NixOS formatting and coding standards.

## Formatting Fixes
- Remove extra newlines and blank spaces
- Fix empty list formatting: [ ] → []
- Remove trailing whitespace
- Standardize indentation in libvirtd config

## Best Practices
- Remove deprecated networking.useDHCP setting
- Remove unused extraHosts configuration
- Add lib.mkDefault to videoDrivers for better override support
- Add lib.mkDefault to podman for consistency

## Modern Conventions
- Update nix.settings.download-buffer-size to string format with units ("512M")
- Update system.stateVersion from 25.05 to 25.11 to match channel
- Update home.stateVersion from 25.05 to 25.11 to match channel

## Code Quality
- Remove commented-out code in aurora.nix
- Improve comment spacing and capitalization
- Standardize attribute set formatting across files

## Files Modified
- flake.nix
- desktop/virtualization.nix
- systems/aurora.nix
- systems/common.nix
- systems/labrizor.nix
- systems/skip01.nix
- users/jsutter.nix

Tested: Successfully rebuilt and switched framework system

desktop/virtualization.nix

@@ -5,7 +5,7 @@
     libvirtd = {
       enable = true;
       qemu.swtpm.enable = true;
-      };
+    };
     spiceUSBRedirection.enable = true;
     docker = {
       rootless = {
@@ -51,16 +51,15 @@
   };
 
   # Optional: Add a debug hook
-systemd.services.network-debug = {
-  description = "Log network status";
-  serviceConfig = {
-    # Use bash and provide full paths for commands
-    ExecStart = "${pkgs.bash}/bin/bash -c '${pkgs.iproute2}/bin/ip a && journalctl -u network.target'";
-    Type = "oneshot";
+  systemd.services.network-debug = {
+    description = "Log network status";
+    serviceConfig = {
+      # Use bash and provide full paths for commands
+      ExecStart = "${pkgs.bash}/bin/bash -c '${pkgs.iproute2}/bin/ip a && journalctl -u network.target'";
+      Type = "oneshot";
+    };
+    wantedBy = [ "network-online.target" ];
   };
-  wantedBy = [ "network-online.target" ];
-};
 
-  virtualisation.libvirtd.allowedBridges =
-    [ "br0" ];
+  virtualisation.libvirtd.allowedBridges = [ "br0" ];
 }