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

drizzle.config.ts

@@ -1,7 +1,7 @@
 import type { Config } from 'drizzle-kit';
 
 export default {
-	schema: './src/lib/server/schema.ts',
+	schema: './src/lib/db/schema.ts',
 	out: './drizzle',
 	dialect: 'postgresql',
 	dbCredentials: {