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-kit/output/server/chunks/state.svelte.js

@@ -0,0 +1,16 @@
+import "clsx";
+import { n as noop } from "./utils2.js";
+import "@sveltejs/kit/internal/server";
+const is_legacy = noop.toString().includes("$$") || /function \w+\(\) \{\}/.test(noop.toString());
+if (is_legacy) {
+  ({
+    data: {},
+    form: null,
+    error: null,
+    params: {},
+    route: { id: null },
+    state: {},
+    status: -1,
+    url: new URL("https://example.com")
+  });
+}