Add start command explicitly to nix run default app

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "elixirLS.projectDir": "server"
+}

flake.nix

@@ -25,6 +25,7 @@
           buildInputs = with pkgs; [
             # Elixir/Erlang for server
             elixir
+            elixir-ls
             erlang
 
             # File watching for Phoenix live reload
@@ -48,7 +49,7 @@
 
           shellHook = ''
             echo "Systant development environment loaded"
-            echo "Elixir: $(elixir --version | head -1)"
+            echo "Elixir: $(elixir --version | tail -1)"
             echo "Node.js: $(node --version)"
             echo ""
             echo "Directories:"
@@ -72,7 +73,7 @@
         apps = {
           default = {
             type = "app";
-            program = "${self.packages.${system}.default}/bin/systant";
+            program = "${self.packages.${system}.default}/bin/systant start";
           };
         };
       }