feat: add example environment variable templates for backend and frontend

.env.example

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+# Domain
+# This would be set to the production domain with an env var on deployment
+# used by Traefik to transmit traffic and acquire TLS certificates
+DOMAIN=localhost
+# To test the local Traefik config
+# DOMAIN=localhost.tiangolo.com
+
+# Used by the backend to generate links in emails to the frontend
+FRONTEND_HOST=http://localhost:5173
+# In staging and production, set this env var to the frontend host, e.g.
+# FRONTEND_HOST=https://dashboard.example.com
+
+# Environment: local, staging, production
+ENVIRONMENT=local
+
+PROJECT_NAME="Full Stack FastAPI Project"
+STACK_NAME=full-stack-fastapi-project
+
+# Backend
+BACKEND_CORS_ORIGINS="http://localhost,http://localhost:5173,https://localhost,https://localhost:5173,http://localhost.tiangolo.com"
+SECRET_KEY=
+FIRST_SUPERUSER=
+FIRST_SUPERUSER_PASSWORD=
+
+# Emails
+SMTP_HOST=
+SMTP_USER=
+SMTP_PASSWORD=
+EMAILS_FROM_EMAIL=
+SMTP_TLS=True
+SMTP_SSL=False
+SMTP_PORT=587
+
+# Postgres
+POSTGRES_SERVER=localhost
+POSTGRES_PORT=5432
+POSTGRES_DB=app
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=
+
+SENTRY_DSN=
+
+# Configure these with your own Docker registry images
+DOCKER_IMAGE_BACKEND=backend
+DOCKER_IMAGE_FRONTEND=frontend

frontend/.env.example

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+VITE_API_URL=http://localhost:8000
+MAILCATCHER_HOST=http://localhost:1080