feat: switch SvelteKit from Cloudflare to node adapter

Deploying to Railway instead of Cloudflare, so swap
@sveltejs/adapter-cloudflare for @sveltejs/adapter-node.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

web/svelte.config.js

@@ -0,0 +1,25 @@
+import adapter from '@sveltejs/adapter-node';
+import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';
+
+/** @type {import('@sveltejs/kit').Config} */
+const config = {
+	// Consult https://svelte.dev/docs/kit/integrations
+	// for more information about preprocessors
+	preprocess: vitePreprocess(),
+	kit: {
+		experimental: {
+			remoteFunctions: true
+		},
+		adapter: adapter(),
+		alias: {
+			'@/*': './src/lib/*'
+		}
+	},
+	compilerOptions: {
+		experimental: {
+			async: true
+		}
+	}
+};
+
+export default config;