Add Tailwind CSS + container list page wired to the Go backend

Verified end-to-end against the real local Docker host.

frontend/vite.config.ts

@@ -1,9 +1,11 @@
+import tailwindcss from '@tailwindcss/vite';
 import adapter from '@sveltejs/adapter-auto';
 import { sveltekit } from '@sveltejs/kit/vite';
 import { defineConfig } from 'vite';
 
 export default defineConfig({
 	plugins: [
+		tailwindcss(),
 		sveltekit({
 			compilerOptions: {
 				// Force runes mode for the project, except for libraries. Can be removed in svelte 6.