ADD: Encore + NextJS + Betterauth template using JWT auth

[Ajay01103]

🚀 PR: Full-Stack Authentication Starter (Encore + Next.js 15)

This PR introduces a production-ready full-stack authentication starter built with Encore on the backend and Next.js 15 on the frontend. It provides a secure, scalable foundation for modern web applications with type-safe APIs and an excellent developer experience.

✨ Key Highlights

• JWT-based authentication powered by Better Auth
• Type-safe API integration using auto-generated Encore clients
• Modern UI built with Shadcn UI and Tailwind CSS
• State management with Redux Toolkit and Redux Persist
• Server state & forms handled via TanStack Query and TanStack Form
• PostgreSQL-backed backend using Encore’s built-in database support
• Responsive, mobile-first design
• Fast developer experience with hot reload and clear project structure

🛠 Tech Stack

Backend

• Encore
• Better Auth
• PostgreSQL
• TypeScript

Frontend

• Next.js 15
• Redux Toolkit + Redux Persist
• TanStack Query & TanStack Form
• Shadcn UI
• Tailwind CSS
• TypeScript

🔑 Core Functionality

• User sign-up, sign-in, and sign-out
• JWT-based authentication and session management
• Session listing and revocation
• Protected API endpoints
• Example services (users, sessions, todos) for reference

[encore-cla]

All committers have signed the CLA.