feat: comprehensive NixOS and home-manager configuration updates

This commit includes significant updates to the Nix configuration including:
- Added common NixOS module with system packages
- Updated home-manager configurations for various systems
- Enhanced terminal programs including Claude Code integration
- Updated LLM server configurations with new models
- Improved btop configuration with custom package
- Added opencode support with permission settings
- Updated tmux and nvim configurations

The changes introduce new features, update existing configurations, and improve the overall system setup.

modules/home/programs/terminal/btop/default.nix

@@ -1,4 +1,9 @@
-{ lib, config, namespace, ... }:
+{ lib
+, pkgs
+, config
+, namespace
+, ...
+}:
 let
   inherit (lib) mkIf;
   cfg = config.${namespace}.programs.terminal.btop;
@@ -9,10 +14,12 @@ in
   };
 
   config = mkIf cfg.enable {
-    programs.btop.enable = true;
+    programs.btop = {
+      enable = true;
+      package = pkgs.btop-cuda;
+    };
 
-    home.file.".config/btop/btop.conf".text =
-      builtins.readFile ./config/btop.conf;
+    home.file.".config/btop/btop.conf".text = builtins.readFile ./config/btop.conf;
     home.file.".config/btop/themes/catppuccin_mocha.theme".text =
       builtins.readFile ./config/catppuccin_mocha.theme;
   };