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

package.json

@@ -17,6 +17,7 @@
 	},
 	"devDependencies": {
 		"@sveltejs/adapter-auto": "^7.0.0",
+		"@sveltejs/adapter-node": "^5.5.2",
 		"@sveltejs/kit": "^2.50.1",
 		"@sveltejs/vite-plugin-svelte": "^6.2.4",
 		"@types/better-sqlite3": "^7.6.13",