update: improve project structure and add linting/formatting

- Remove duplicate lucide-svelte package, keep @lucide/svelte
- Move schema from src/lib/server/ to src/lib/db/ for better organization
- Add path aliases to svelte.config.js (, , , , )
- Add ESLint and Prettier configuration with 2-space indentation
- Update all imports to use new schema location and icon package

src/routes/dashboard/+page.svelte

@@ -6,7 +6,7 @@
 	import WishlistSection from '$lib/components/dashboard/WishlistSection.svelte';
 	import LocalWishlistsSection from '$lib/components/dashboard/LocalWishlistsSection.svelte';
 	import { enhance } from '$app/forms';
-	import { Star } from 'lucide-svelte';
+	import { Star } from '@lucide/svelte';
 	import { languageStore } from '$lib/stores/language.svelte';
 
 	let { data }: { data: PageData } = $props();