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

modules/nixos-modules/ollama/storage.nix

@@ -0,0 +1,49 @@
+{
+  config,
+  lib,
+  ...
+}: {
+  options = {
+    services.ollama.impermanence.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = config.services.ollama.enable && config.storage.impermanence.enable;
+    };
+  };
+
+  config = lib.mkIf config.services.ollama.enable (
+    lib.mkMerge [
+      (lib.mkIf config.storage.zfs.enable (lib.mkMerge [
+        {
+          # Ollama needs persistent storage for models and configuration
+        }
+        (lib.mkIf (!config.services.ollama.impermanence.enable) {
+          # TODO: placeholder to configure a unique dataset for this service
+        })
+        (lib.mkIf config.services.ollama.impermanence.enable {
+          storage.impermanence.datasets."persist/system/root" = {
+            directories."/var/lib/private/ollama" = {
+              enable = true;
+              owner.name = config.services.ollama.user;
+              group.name = config.services.ollama.group;
+              owner.permissions = {
+                read = true;
+                write = true;
+                execute = false;
+              };
+              group.permissions = {
+                read = false;
+                write = false;
+                execute = false;
+              };
+              other.permissions = {
+                read = false;
+                write = false;
+                execute = false;
+              };
+            };
+          };
+        })
+      ]))
+    ]
+  );
+}