Add password reset functionality with form components, pages, and tests

- Implemented `PasswordResetRequestForm` and `PasswordResetConfirmForm` components with email and password validation, strength indicators, and error handling.
- Added dedicated pages for requesting and confirming password resets, integrated with React Query hooks and Next.js API routes.
- Included tests for validation rules, UI states, and token handling to ensure proper functionality and coverage.
- Updated ESLint and configuration files for new components and pages.
- Enhanced `IMPLEMENTATION_PLAN.md` with updated task details and documentation for password reset workflows.

frontend/src/app/(auth)/layout.tsx

@@ -0,0 +1,19 @@
+import type { Metadata } from 'next';
+
+export const metadata: Metadata = {
+  title: 'Authentication',
+};
+
+export default function AuthLayout({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-gray-50 dark:bg-gray-900 px-4 py-12 sm:px-6 lg:px-8">
+      <div className="w-full max-w-md space-y-8">
+        {children}
+      </div>
+    </div>
+  );
+}