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/node_modules/dayjs/esm/plugin/buddhistEra/index.d.ts

@@ -0,0 +1,4 @@
+import { PluginFunc } from 'dayjs/esm'
+
+declare const plugin: PluginFunc
+export = plugin

frontend/node_modules/dayjs/esm/plugin/buddhistEra/index.js

@@ -0,0 +1,21 @@
+import { FORMAT_DEFAULT } from '../../constant';
+export default (function (o, c) {
+  // locale needed later
+  var proto = c.prototype;
+  var oldFormat = proto.format; // extend en locale here
+
+  proto.format = function (formatStr) {
+    var _this = this;
+
+    var yearBias = 543;
+    var str = formatStr || FORMAT_DEFAULT;
+    var result = str.replace(/(\[[^\]]+])|BBBB|BB/g, function (match, a) {
+      var _this$$utils;
+
+      var year = String(_this.$y + yearBias);
+      var args = match === 'BB' ? [year.slice(-2), 2] : [year, 4];
+      return a || (_this$$utils = _this.$utils()).s.apply(_this$$utils, args.concat(['0']));
+    });
+    return oldFormat.bind(this)(result);
+  };
+});