feat: refactor packages and add update scripts

packages/todo-mcp/package.nix

@@ -0,0 +1,39 @@
+{ pkgs, ... }:
+
+let
+  version = "v0.2.1";
+in
+pkgs.rustPlatform.buildRustPackage {
+  pname = "todo-mcp";
+  inherit version;
+
+  src = pkgs.fetchFromGitea {
+    domain = "git.janezic.dev";
+    owner = "janezicmatej";
+    repo = "todo-mcp";
+    rev = version;
+    sha256 = "sha256-BBL7PAgTdGR/+vEJmot8c8mgw5vq5Y/szud0YEiR1UY=";
+  };
+
+  cargoHash = "sha256-uAyD7Tj9qctDXQ5NkR6T/aItxRmd5WqIXr7NeOlCl8M=";
+
+  nativeBuildInputs = [ pkgs.installShellFiles ];
+
+  preBuild = ''
+    mkdir -p completions
+  '';
+
+  SHELL_COMPLETIONS_DIR = "completions";
+
+  postInstall = ''
+    installShellCompletion --bash completions/todo-mcp.bash
+    installShellCompletion --zsh completions/_todo-mcp
+    installShellCompletion --fish completions/todo-mcp.fish
+  '';
+
+  meta = {
+    description = "simple todo cli with mcp server for ai integration";
+    homepage = "https://git.janezic.dev/janezicmatej/todo-mcp";
+    maintainers = [ ];
+  };
+}