feat(lib/mkSystem): add profile suppoet

This commit adds the mkSystem function to simplify nixosSystem
creation and merge profile configs.

modules/lib/default.nix

@@ -7,13 +7,28 @@
 let
   inherit (lib.trivial) pipe;
   inherit (lib.strings) removePrefix hasPrefix;
-  inherit (lib.attrsets) concatMapAttrs mapAttrs' filterAttrs;
+  inherit (lib.attrsets)
+    concatMapAttrs
+    mapAttrs'
+    filterAttrs
+    mergeAttrsList
+    ;
+in
+{
+  flake.lib = rec {
+    flattenAttrs = attrset: concatMapAttrs (_: v: v) attrset;
     mkSystem =
       prefix: name: value:
       let
         hostName = removePrefix prefix name;
         hostConfig = value;
         flakeConfig = config;
+        mkProfileCfg =
+          profileList: # List of attrsets of nixos configs
+          pipe profileList [
+            (map flattenAttrs) # List of nixos configs
+            mergeAttrsList
+          ];
       in
       {
         name = hostName;
@@ -28,14 +43,11 @@ let
           };
           modules = [
             config.flake.profiles.nixos.common
+            (mkProfileCfg (value.profiles or [ ]))
             (value.extraCfg or { })
-        ] ++ (value.profiles or [ ]);
+          ];
         };
       };
-in
-{
-  flake.lib = {
-    flattenAttrs = attrset: concatMapAttrs (_: v: v) attrset;
     extractConfigurations =
       prefix: hosts:
       pipe hosts [