feat: Reinitialize frontend with SvelteKit and TypeScript

- Delete old Vite+Svelte frontend
- Initialize new SvelteKit project with TypeScript
- Configure Tailwind CSS v4 + DaisyUI
- Implement JWT authentication with auto-refresh
- Create login page with form validation (Zod)
- Add protected route guards
- Update Docker configuration for single-stage build
- Add E2E tests with Playwright (6/11 passing)
- Fix Svelte 5 reactivity with $state() runes

Known issues:
- 5 E2E tests failing (timing/async issues)
- Token refresh implementation needs debugging
- Validation error display timing

frontend/.svelte-kit/adapter-node/entries/fallbacks/error.svelte.js

@@ -0,0 +1,43 @@
+import { g as getContext, e as escape_html } from "../../chunks/root.js";
+import "clsx";
+import "../../chunks/state.svelte.js";
+import "@sveltejs/kit/internal";
+import { w as writable } from "../../chunks/exports.js";
+import "../../chunks/utils.js";
+import "@sveltejs/kit/internal/server";
+function create_updated_store() {
+  const { set, subscribe } = writable(false);
+  {
+    return {
+      subscribe,
+      // eslint-disable-next-line @typescript-eslint/require-await
+      check: async () => false
+    };
+  }
+}
+const stores = {
+  updated: /* @__PURE__ */ create_updated_store()
+};
+({
+  check: stores.updated.check
+});
+function context() {
+  return getContext("__request__");
+}
+const page$1 = {
+  get error() {
+    return context().page.error;
+  },
+  get status() {
+    return context().page.status;
+  }
+};
+const page = page$1;
+function Error$1($$renderer, $$props) {
+  $$renderer.component(($$renderer2) => {
+    $$renderer2.push(`<h1>${escape_html(page.status)}</h1> <p>${escape_html(page.error?.message)}</p>`);
+  });
+}
+export {
+  Error$1 as default
+};

frontend/.svelte-kit/adapter-node/entries/fallbacks/layout.svelte.js

@@ -0,0 +1,9 @@
+import "clsx";
+function Layout($$renderer, $$props) {
+  let { children } = $$props;
+  children($$renderer);
+  $$renderer.push(`<!---->`);
+}
+export {
+  Layout as default
+};