feat: implement full backend API for Pantree Phase 1 MVP

.env.example

@@ -0,0 +1,39 @@
+# ─────────────────────────────────────────────
+# Pantree Backend — Environment Variables
+# Copy to .env and fill in real values.
+# NEVER commit .env to version control.
+# ─────────────────────────────────────────────
+
+# Server
+PORT=3000
+NODE_ENV=development
+
+# PostgreSQL
+DB_HOST=localhost
+DB_PORT=5432
+DB_NAME=pantree
+DB_USER=postgres
+DB_PASSWORD=changeme
+
+# JWT — use a long random secret in production
+JWT_SECRET=change-this-to-a-long-random-secret
+JWT_EXPIRES_IN=24h
+
+# Google OAuth
+GOOGLE_CLIENT_ID=your-google-client-id.apps.googleusercontent.com
+
+# Email (SMTP / SendGrid / SES)
+EMAIL_HOST=smtp.ethereal.email
+EMAIL_PORT=587
+EMAIL_USER=
+EMAIL_PASS=
+EMAIL_FROM=noreply@pantree.app
+
+# App base URL (used in password-reset links)
+APP_BASE_URL=https://pantree.app
+
+# Account deletion window (days)
+ACCOUNT_DELETION_DAYS=15
+
+# Password reset token expiry (hours)
+RESET_TOKEN_EXPIRY_HOURS=1