feat(06-01): switch to adapter-node with environment prefix

- Install @sveltejs/adapter-node as dev dependency
- Configure adapter with out: 'build', precompress: true
- Set envPrefix to 'TASKPLANER_' for environment variables

svelte.config.js

@@ -1,12 +1,13 @@
-import adapter from '@sveltejs/adapter-auto';
+import adapter from '@sveltejs/adapter-node';
 
 /** @type {import('@sveltejs/kit').Config} */
 const config = {
 	kit: {
-		// adapter-auto only supports some environments, see https://svelte.dev/docs/kit/adapter-auto for a list.
-		// If your environment is not supported, or you settled on a specific environment, switch out the adapter.
-		// See https://svelte.dev/docs/kit/adapters for more information about adapters.
-		adapter: adapter()
+		adapter: adapter({
+			out: 'build',
+			precompress: true,
+			envPrefix: 'TASKPLANER_'
+		})
 	}
 };