refactor: moved darwin, home-manager, and system configurations to dendrite pattern

modules/darwin/system.nix

@@ -0,0 +1,29 @@
+{...}: {
+  flake.darwinModules.darwin-system = {self, ...}: {
+    system.configurationRevision = self.rev or self.dirtyRev or null;
+
+    nix = {
+      gc = {
+        automatic = true;
+        interval = [
+          {
+            Hour = 4;
+            Minute = 15;
+            Weekday = 7;
+          }
+        ];
+        options = "--delete-older-than 7d";
+      };
+      optimise = {
+        automatic = true;
+        interval = [
+          {
+            Hour = 4;
+            Minute = 15;
+            Weekday = 7;
+          }
+        ];
+      };
+    };
+  };
+}