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;
   };

modules/home/programs/terminal/claude-code/default.nix

@@ -0,0 +1,81 @@
+{ lib
+, pkgs
+, config
+, namespace
+, ...
+}:
+let
+  inherit (lib) mkIf;
+  cfg = config.${namespace}.programs.terminal.claude-code;
+in
+{
+  options.${namespace}.programs.terminal.claude-code = {
+    enable = lib.mkEnableOption "enable claude-code";
+  };
+
+  config = mkIf cfg.enable {
+    programs.claude-code = {
+      enable = true;
+      mcpServers = {
+        gopls = {
+          type = "stdio";
+          command = "gopls";
+          args = [ "mcp" ];
+        };
+      };
+    };
+
+    programs.bash = lib.mkIf config.programs.bash.enable {
+      shellAliases = {
+        claude = "default_claude_custom";
+      };
+
+      initExtra =
+        let
+          baseUrl = "https://llm-api.va.reichard.io";
+          authToken = "placeholder";
+        in
+        ''
+          default_claude_custom() {
+            local model_id=""
+            while [[ $# -gt 0 ]]; do
+              case $1 in
+                -m|--model)
+                  model_id="$2"
+                  shift 2
+                  ;;
+                *)
+                  shift
+                  ;;
+              esac
+            done
+
+            if [ -z "$model_id" ]; then
+              echo "Error: Model ID is required. Usage: claude --model <model-id>"
+              return 1
+            fi
+
+            ANTHROPIC_BASE_URL="${baseUrl}" \
+            ANTHROPIC_AUTH_TOKEN="${authToken}" \
+            ANTHROPIC_MODEL="$model_id" \
+            ANTHROPIC_SMALL_FAST_MODEL="$model_id" \
+            ${lib.getExe pkgs.claude-code}
+          }
+
+          # Completion Function
+          _complete_claude_custom() {
+            local cur=''${COMP_WORDS[COMP_CWORD]}
+            local prev=''${COMP_WORDS[COMP_CWORD-1]}
+
+            if [[ "$prev" == "-m" || "$prev" == "--model" ]]; then
+              local models=( $(${pkgs.curl}/bin/curl -s -H "Authorization: Bearer ${authToken}" "${baseUrl}/v1/models" | ${pkgs.jq}/bin/jq -r '.data[].id' 2>/dev/null) )
+              COMPREPLY=( $(compgen -W "''${models[*]}" -- "$cur") )
+            fi
+          }
+
+          # Register Completion
+          complete -F _complete_claude_custom claude
+        '';
+    };
+  };
+}

modules/home/programs/terminal/nvim/config/lua/llm.lua

@@ -1,6 +1,9 @@
 local llm_endpoint = "https://llm-api.va.reichard.io"
-local llm_assistant_model = "gpt-oss-20b-thinking"
-local llm_infill_model = "qwen2.5-coder-3b-instruct"
+-- local llm_assistant_model = "gpt-oss-20b-thinking"
+-- local llm_infill_model = "qwen2.5-coder-3b-instruct"
+
+local llm_assistant_model = "qwen3-30b-2507-instruct"
+local llm_infill_model = llm_assistant_model
 
 -- Default Llama - Toggle Llama & Copilot
 -- vim.g.copilot_filetypes = { ["*"] = false }

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

@@ -1,4 +1,5 @@
 { lib
+, pkgs
 , config
 , namespace
 , ...
@@ -18,6 +19,22 @@ in
       enableMcpIntegration = true;
       settings = {
         theme = "catppuccin";
+        permission = {
+          edit = "allow";
+          bash = "ask";
+          webfetch = "ask";
+          doom_loop = "ask";
+          external_directory = "ask";
+        };
+        lsp = {
+          nil = {
+            command = [
+              "${pkgs.nil}/bin/nil"
+              "--stdio"
+            ];
+            extensions = [ ".nix" ];
+          };
+        };
         provider = {
           "llama-swap" = {
             npm = "@ai-sdk/openai-compatible";

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

@@ -1,4 +1,9 @@
-{ lib, pkgs, config, namespace, ... }:
+{ lib
+, pkgs
+, config
+, namespace
+, ...
+}:
 let
   inherit (lib) mkIf;
   cfg = config.${namespace}.programs.terminal.tmux;

modules/nixos/common/default.nix

@@ -0,0 +1,6 @@
+{ pkgs, ... }:
+{
+  environment.systemPackages = with pkgs; [
+    wget
+  ];
+}