Add theia stuffies

systems/theia/default.nix

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+{
+  imports = [
+    ./hardware.nix
+    ./networking.nix
+    ./overrides.nix
+    ./services.nix
+  ];
+
+  olympus = {
+    device = {
+      cpu = "vm-amd";
+      gpu = null;
+    };
+    system = {
+      boot = {
+        loader = "grub";
+        loadRecommendedModules = true;
+        enableKernelTweaks = true;
+        initrd.enableTweaks = true;
+        plymouth.enable = false;
+      };
+    };
+  };
+}

systems/theia/hardware.nix

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+{
+  fileSystems = {
+    "/" = {
+      device = "/dev/disk/by-uuid/09e65ff9-2195-41d8-b6a4-671c306742c3";
+      fsType = "ext4";
+    };
+
+    "/boot" = {
+      device = "/dev/disk/by-uuid/FED3-A372";
+      fsType = "vfat";
+      options = ["fmask=0022" "dmask=0022"];
+    };
+  };
+  swapDevices = [
+    {
+      device = "/var/lib/swapfile";
+      size = 16 * 1024;
+    }
+  ];
+}

systems/theia/networking.nix

@@ -0,0 +1 @@
+{}

systems/theia/overrides.nix

@@ -0,0 +1,53 @@
+{
+  lib,
+  pkgs,
+  config,
+  modulesPath,
+  ...
+}: let
+  inherit (lib.modules) mkForce;
+in {
+  imports = [(modulesPath + "/profiles/qemu-guest.nix")];
+
+  config = {
+    services = {
+      smartd.enable = mkForce false; # Unavailable - device lacks SMART capability.
+      qemuGuest.enable = true;
+    };
+    systemd.services.qemu-guest-agent.path = [pkgs.shadow];
+
+    system.stateVersion = mkForce "25.04";
+
+    boot = {
+      kernelParams = ["net.ifnames=0"];
+      kernel.sysctl = {
+        "net.ipv4.ip_forward" = true;
+        "net.ipv6.conf.all.forwarding" = true;
+      };
+
+      initrd = {
+        availableKernelModules = [
+          "ata_piix"
+          "uhci_hcd"
+          "virtio_pci"
+          "virtio_scsi"
+          "ahci"
+          "sr_mod"
+          "virtio_blk"
+        ];
+        kernelModules = ["dm-snapshot"];
+      };
+
+      loader.grub = {
+        enable = true;
+        useOSProber = mkForce false;
+        efiSupport = mkForce false;
+        enableCryptodisk = false;
+        theme = mkForce null;
+        backgroundColor = mkForce null;
+        splashImage = mkForce null;
+        device = mkForce "/dev/vda";
+      };
+    };
+  };
+}

systems/theia/services.nix

@@ -0,0 +1 @@
+{}