MVP authentication backend implementation

.env.example

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+# Database (PostgreSQL)
+DATABASE_URL="postgresql://user:password@localhost:5432/cloudpeople"
+
+# Node environment
+NODE_ENV="development"
+
+# Application URL (for email links in production)
+APP_URL="http://localhost:3000"
+
+# OAuth Providers (optional - not enabled by default)
+# Uncomment and configure to enable OAuth
+
+# Google OAuth
+# GOOGLE_CLIENT_ID=""
+# GOOGLE_CLIENT_SECRET=""
+
+# GitHub OAuth
+# GITHUB_CLIENT_ID=""
+# GITHUB_CLIENT_SECRET=""

.eslintrc.json

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+{
+  "extends": "next/core-web-vitals"
+}

.gitignore

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+# Dependencies
+node_modules/
+
+# Next.js
+.next/
+out/
+
+# Environment
+.env
+.env.local
+.env.*.local
+
+# Build
+*.tsbuildinfo
+
+# IDE
+.idea/
+.vscode/
+
+# OS
+.DS_Store
+
+# Logs
+*.log
+npm-debug.log*