update: system update & refactor

# Breaking Changes
- sops location movod to "system/dev/<dev-name>/sops/sops-conf.nix"
- flake devices declaration changes
- whole flake update

system/dev/dn-server/common/default.nix

@@ -0,0 +1,14 @@
+{
+  imports = [
+    ../../../modules/presets/minimal.nix
+    ../../../modules/bluetooth.nix
+    ../../../modules/gc.nix
+    ../../../modules/stylix.nix
+    ../../../modules/postgresql.nix
+    ./backup.nix
+    ./boot.nix
+    ./hardware-configuration.nix
+    ./networking.nix
+    ./nvidia.nix
+  ];
+}