chore: add cachyos binary cache

flake.nix

@@ -1,6 +1,17 @@
 {
   description = "NixOS flake";
 
+  nixConfig = {
+    extra-substituters = [
+      "https://claude-code.cachix.org"
+      "https://attic.xuyh0120.win/lantian"
+    ];
+    extra-trusted-public-keys = [
+      "claude-code.cachix.org-1:YeXf2aNu7UTX8Vwrze0za1WEDS+4DuI2kVeWEE4fsRk="
+      "lantian:EeAUQ+W+6r7EtwnmYjeVwx5kOGEBpjlBfPlzGlTNvHc="
+    ];
+  };
+
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     nixpkgs-2605.url = "github:NixOS/nixpkgs/nixos-26.05";

lib/mkNixosSystem.nix

@@ -40,8 +40,14 @@ nixpkgs.lib.nixosSystem {
         nix-cachyos-kernel.overlays.pinned
       ] ++ (import ../overlays/pkgs.nix { inherit bun2nix; });
       nix.settings = {
-        substituters = [ "https://claude-code.cachix.org" ];
+        substituters = [ 
-        trusted-public-keys = [ "claude-code.cachix.org-1:YeXf2aNu7UTX8Vwrze0za1WEDS+4DuI2kVeWEE4fsRk=" ];
+          "https://claude-code.cachix.org" 
+          "https://attic.xuyh0120.win/lantian"
+        ];
+        trusted-public-keys = [ 
+          "claude-code.cachix.org-1:YeXf2aNu7UTX8Vwrze0za1WEDS+4DuI2kVeWEE4fsRk=" 
+          "lantian:EeAUQ+W+6r7EtwnmYjeVwx5kOGEBpjlBfPlzGlTNvHc="
+        ];
       };
     }
     lanzaboote.nixosModules.lanzaboote