refactor: split server modules into smaller more manageable files

modules/nixos-modules/server/panoramax/impermanence.nix

@@ -0,0 +1,14 @@
+{
+  lib,
+  config,
+  osConfig,
+  ...
+}: {
+  config = lib.mkIf (config.services.panoramax.enable && osConfig.host.impermanence.enable) {
+    # TODO: configure impermanence for panoramax data
+    # This would typically include directories like:
+    # - /var/lib/panoramax
+    # - panoramax storage directories
+    # - any cache or temporary directories that need to persist
+  };
+}