feat: add Privy Auth community template

[satyawaniaman]

##Demo

privy-demo.mp4

Overview

This PR adds a new community template for authentication using Privy with Solana embedded wallets.

Template Features

• Social Logins: Google, Twitter, Discord, GitHub, and Email authentication via Privy
• Embedded Wallets: Automatic Solana wallet creation on login (no browser extension needed)
• Protected Routes: Auth-gated dashboard with automatic redirect for unauthenticated users
• Wallet Operations: View wallet address, check SOL balance, and sign messages
• Session Management: Privy handles tokens, refresh flows, and auth state
• Modern UI: Dark theme with Solana branding (purple/green gradients)

Tech Stack

• Next.js 15 with App Router
• Privy for authentication and embedded wallets
• @solana/kit for Solana RPC interactions
• Tailwind CSS 4 for styling
• TypeScript for type safety

Checklist

• Template placed in community/privy-auth/ directory
• package.json includes required metadata (name, displayName, description, usecase, keywords)
• og-image.png generated (1200x630 pixels, under 500KB)
• All files formatted with pnpm format
• pnpm lint passes all checks
• Template tested locally
• Comprehensive README with setup instructions
• .env.example included for configuration

Demo

Users can install this template with:

npx create-solana-dapp@latest --template privy-auth

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