feat(attic): enable IPv6 router solicitation via dhcpcd

- Set `networking.dhcpcd.IPv6rs` to `true` in `default.nix` to support IPv6 router solicitation.
- Ensures better compatibility with networks requiring IPv6 RA for configuration.

systems/x86_64-linux/attic/atticd.nix

@@ -31,6 +31,13 @@
 
       listen = "[::]:8080";
 
+      storage = {
+        type = "s3";
+        bucket = "attic";
+        region = "hel1";
+        endpoint = "https://hel1.your-objectstorage.com";
+      };
+
       # Data chunking
       #
       # Warning: If you change any of the values here, it will be

systems/x86_64-linux/attic/default.nix

@@ -2,8 +2,6 @@
   lib,
   ...
 }:
-with lib;
-with lib.metacfg;
 {
   imports = [
     ./hardware-configuration.nix
@@ -26,14 +24,20 @@ with lib.metacfg;
     podman.dockerCompat = false;
   };
 
+  # Legacy BIOS boot (Hetzner cloud instance)
+  boot.loader.systemd-boot.enable = lib.mkForce false;
+  boot.loader.efi.canTouchEfiVariables = lib.mkForce false;
+  boot.loader.grub.enable = true;
+
   security.tpm2.enable = false;
   security.tpm2.abrmd.enable = false;
 
-  networking.wireless.enable = false; # Enables wireless support via wpa_supplicant.
+  networking.wireless.enable = false;
+  networking.dhcpcd.IPv6rs = true;
   networking.firewall.allowedTCPPorts = [ 8080 ];
   networking.firewall.allowPing = true;
 
   powerManagement.cpuFreqGovernor = "ondemand";
 
-  system.stateVersion = "24.05";
+  system.stateVersion = "25.11";
 }

systems/x86_64-linux/attic/disko.nix

@@ -16,15 +16,6 @@
               size = "1M";
               type = "EF02"; # for grub MBR
             };
-            ESP = {
-              size = "1G";
-              type = "EF00";
-              content = {
-                type = "filesystem";
-                format = "vfat";
-                mountpoint = "/boot";
-              };
-            };
             root = {
               size = "100%";
               content = {

systems/x86_64-linux/attic/hardware-configuration.nix

@@ -14,7 +14,7 @@
     ./disko.nix
     (modulesPath + "/profiles/qemu-guest.nix")
   ];
-  disko.devices.disk.main.device = "/dev/vda";
+  disko.devices.disk.main.device = "/dev/sda";
 
   boot.initrd.availableKernelModules = [
     "ahci"