feat: moved ollama, tailscale, and sync into folders following the new storage pattern

modules/nixos-modules/tailscale/default.nix

@@ -0,0 +1,6 @@
+{...}: {
+  imports = [
+    ./tailscale.nix
+    ./storage.nix
+  ];
+}

modules/nixos-modules/tailscale/storage.nix

@@ -0,0 +1,36 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  tailscale_data_directory = "/var/lib/tailscale";
+in {
+  options = {
+    services.tailscale.impermanence.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = config.services.tailscale.enable && config.storage.impermanence.enable;
+    };
+  };
+
+  config = lib.mkIf config.services.tailscale.enable (
+    lib.mkMerge [
+      (lib.mkIf config.storage.zfs.enable (lib.mkMerge [
+        {
+          # Tailscale needs persistent storage for keys and configuration
+        }
+        (lib.mkIf (!config.services.tailscale.impermanence.enable) {
+          # TODO: placeholder to configure a unique dataset for this service
+        })
+        (lib.mkIf config.services.tailscale.impermanence.enable {
+          storage.impermanence.datasets."persist/system/root" = {
+            directories."${tailscale_data_directory}" = {
+              enable = true;
+              owner.name = "root";
+              group.name = "root";
+            };
+          };
+        })
+      ]))
+    ]
+  );
+}

modules/nixos-modules/tailscale/tailscale.nix

@@ -0,0 +1,19 @@
+{
+  config,
+  lib,
+  ...
+}: {
+  options = {
+    host.tailscale = {
+      enable = lib.mkEnableOption "should tailscale be enabled on this computer";
+    };
+  };
+
+  config = lib.mkIf config.services.tailscale.enable (
+    lib.mkMerge [
+      {
+        # any configs we want shared between all machines
+      }
+    ]
+  );
+}