chore: update Nix configurations for Nixcloud and common hosts

- Add Nixcloud host configurations including networking, hardware, and system settings
- Refactor existing configurations for clarity and organization
- Remove unused podman configuration from home-manager
- Update SSH agent settings and session variables in Nixbook host

hosts/Nixcloud/nixos/configuration.nix

@@ -0,0 +1,15 @@
+{ ... }: {
+  imports = [
+    ./hardware-configuration.nix
+    ./networking.nix # generated at runtime by nixos-infect
+    
+  ];
+
+  boot.tmp.cleanOnBoot = true;
+  zramSwap.enable = true;
+  networking.hostName = "srv1065175";
+  networking.domain = "hstgr.cloud";
+  services.openssh.enable = true;
+  users.users.root.openssh.authorizedKeys.keys = [''ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCWstSULudWNwPQxyS2J7Qygw8CozDDy8WsPjsYzKPI9s0B/KLU0g1oX42bBvn4DgNpzGrpb6IGHpRQohStt7vcOxb9XpfhIOcIr45gU3k3lcPjh6vj8/ZoNQlRDIfxs83RDImvveYABuI/Hq42mLV1kI5qnQHaJxuW73AuYKNzE3Z3PUl5Kw6MgzSZ96QlpiQDn/js7ZTBF/YZ18kPh9E9O1y+EDhcJ4gn38rFIMYMG/KbJB22hYyYQHo0WkJlZ2jScnjv1op2yHPM4lfjOnnyL+LhOQLN8VrHayDWXtJcIW0nEKT+1R/7qkSH/5ELA2c/gznfkdTDzfG8+P3WAzNF openpgp:0xC25417F1 n3k0'' '''' ''ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICRAJaRuXqVeAs/Y5CeTbyc9lSbyvchkVqiML/yl6wbh thiago@Nixbook'' ];
+  system.stateVersion = "23.11";
+}

hosts/Nixcloud/nixos/hardware-configuration.nix

@@ -0,0 +1,9 @@
+{ modulesPath, ... }:
+{
+  imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
+  boot.loader.grub.device = "/dev/sda";
+  boot.initrd.availableKernelModules = [ "ata_piix" "uhci_hcd" "xen_blkfront" "vmw_pvscsi" ];
+  boot.initrd.kernelModules = [ "nvme" ];
+  fileSystems."/" = { device = "/dev/sda1"; fsType = "ext4"; };
+  
+}

hosts/Nixcloud/nixos/networking.nix

@@ -0,0 +1,35 @@
+{ lib, ... }: {
+  # This file was populated at runtime with the networking
+  # details gathered from the active system.
+  networking = {
+    nameservers = [ "45.143.83.10"
+ "1.1.1.1"
+ "8.8.4.4"
+ ];
+    defaultGateway = "72.61.129.254";
+    defaultGateway6 = {
+      address = "2a02:4780:66::1";
+      interface = "eth0";
+    };
+    dhcpcd.enable = false;
+    usePredictableInterfaceNames = lib.mkForce false;
+    interfaces = {
+      eth0 = {
+        ipv4.addresses = [
+          { address="72.61.129.56"; prefixLength=24; }
+        ];
+        ipv6.addresses = [
+          { address="2a02:4780:66:9ac0::1"; prefixLength=48; }
+{ address="fe80::9ce8:d4ff:feb5:50d7"; prefixLength=64; }
+        ];
+        ipv4.routes = [ { address = "72.61.129.254"; prefixLength = 32; } ];
+        ipv6.routes = [ { address = "2a02:4780:66::1"; prefixLength = 128; } ];
+      };
+      
+    };
+  };
+  services.udev.extraRules = ''
+    ATTR{address}=="9e:e8:d4:b5:50:d7", NAME="eth0"
+    
+  '';
+}