chore(flake): migrate base to nixos-25.11 and add hybrid channels

Updates system base to stable channel (25.11) for reliability.
Adds 'unstable' and 'master' inputs with allowUnfree=true to support specific bleeding-edge packages via extraSpecialArgs.

Author: pedrobrantes

flake.nix

@@ -2,33 +2,44 @@
   description = "My Personal Home Manager Configuration";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
-    home-manager.url = "github:nix-community/home-manager";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
+    nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
+    nixpkgs-master.url = "github:nixos/nixpkgs/master";
+
+    home-manager.url = "github:nix-community/home-manager/release-25.11";
     home-manager.inputs.nixpkgs.follows = "nixpkgs";
+
     sops-nix.url = "github:mic92/sops-nix";
     sops-nix.inputs.nixpkgs.follows = "nixpkgs";
+
     bash-it = {
       url = "github:Bash-it/bash-it";
       flake = false;
     };
   };
 
-  outputs = { self, nixpkgs, home-manager, sops-nix, bash-it }@inputs:
+  outputs = { self, nixpkgs, nixpkgs-unstable, nixpkgs-master, home-manager, sops-nix, bash-it }@inputs:
     let
-      mkHome = { username, system }: home-manager.lib.homeManagerConfiguration {
-        pkgs = nixpkgs.legacyPackages.${system};
-        extraSpecialArgs = { 
-          inherit sops-nix;
-          inherit inputs;
+      mkHome = { username, system }:
+        let
+          config = { allowUnfree = true; };
+          pkgs = import nixpkgs { inherit system config; };
+          pkgsUnstable = import nixpkgs-unstable { inherit system config; };
+          pkgsMaster = import nixpkgs-master { inherit system config; };
+        in
+        home-manager.lib.homeManagerConfiguration {
+          inherit pkgs;
+          extraSpecialArgs = {
+            inherit sops-nix inputs pkgsUnstable pkgsMaster;
+          };
+          modules = [
+            {
+              home.username = username;
+              home.homeDirectory = "/home/${username}";
+            }
+            ./home.nix
+          ];
         };
-        modules = [
-          {
-            home.username = username;
-            home.homeDirectory = "/home/${username}";
-          }
-          ./home.nix
-        ];
-      };
     in
     {
       homeConfigurations = {