add flake and move to npm

AGENTS.md

@@ -6,21 +6,21 @@ This is a SvelteKit 5 project with TypeScript and Tailwind CSS for a router dash
 
 ```bash
 # Development server
-deno run dev
+npm run dev
 
 # Build for production
-deno run build
+npm run build
 
 # Preview production build
-deno run preview
+npm run preview
 
 # Type checking
-deno run check
-deno run check:watch
+npm run check
+npm run check:watch
 
 # Linting and formatting
-deno run lint
-deno run format
+npm run lint
+npm run format
 ```
 
 ## Code Style Guidelines