Refactor common modules.

common/cluster-member.nix

@@ -0,0 +1,14 @@
+{ pkgs, ... }:
+{
+  # Cluster node configuration
+  # Extends minimal-node with cluster-specific services (Consul, GlusterFS, CIFS, NFS)
+  # Used by: compute nodes (c1, c2, c3)
+  imports = [
+    ./minimal-node.nix
+    ./unattended-encryption.nix
+    ./cifs-client.nix
+    ./consul.nix
+    ./glusterfs-client.nix  # Keep during migration, will be removed in Phase 3
+    ./nfs-services-client.nix  # New: NFS client for /data/services
+  ];
+}