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/@vinejs/vine/build/src/errors/main.d.ts

@@ -0,0 +1,5 @@
+import { ValidationError } from './validation_error.js';
+/**
+ * Create an instance of validation error
+ */
+export declare const E_VALIDATION_ERROR: typeof ValidationError;

frontend/node_modules/@vinejs/vine/build/src/errors/validation_error.d.ts

@@ -0,0 +1,19 @@
+/**
+ * Validation error is a superset of Error class with validation
+ * error messages
+ */
+export declare class ValidationError extends Error {
+    messages: any;
+    /**
+     * Http status code for the validation error
+     */
+    status: number;
+    /**
+     * Internal code for handling the validation error
+     * exception
+     */
+    code: string;
+    constructor(messages: any, options?: ErrorOptions);
+    get [Symbol.toStringTag](): string;
+    toString(): string;
+}