Add ModeTemplate with Svelte 5 frontend and components

- Create reusable components: auth, api-client, shared-types
- ModeTemplate with Hono backend and SvelteKit frontend
- Auth store refactored to class-based Svelte 5 pattern
- SSR-safe hydrate() pattern for localStorage access
- Frontend builds successfully with Svelte 5 runes

ModeTemplate/frontend/svelte.config.js

@@ -0,0 +1,21 @@
+import adapter from '@sveltejs/adapter-static';
+import { vitePreprocess } from '@sveltejs/vite-plugin-svelte';
+
+/** @type {import('@sveltejs/kit').Config} */
+const config = {
+  preprocess: vitePreprocess(),
+  kit: {
+    adapter: adapter({
+      pages: 'build',
+      assets: 'build',
+      fallback: 'index.html',
+      precompress: false,
+    }),
+    alias: {
+      '$lib': './src/lib',
+      '$types': '../types',
+    },
+  },
+};
+
+export default config;