Initial commit: docker compose for frame stack

backend.env.example

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+# Database
+DATABASE_URL=postgres://postgres:postgres@postgres:5432/appdb?sslmode=disable
+DB_AUTO_MIGRATE=true
+
+# Auth
+JWT_SECRET=change_me_in_production
+
+# CORS — must include the URL where frame-cms is served
+CORS_ALLOWED_ORIGINS=http://localhost:3000
+
+# Frontend base URL used in email links
+FRONTEND_BASE_URL=http://localhost:3000
+
+# SMTP (optional — without this, email verification won't work)
+# SMTP_HOST=smtp.example.com
+# SMTP_PORT=587
+# SMTP_USERNAME=user@example.com
+# SMTP_PASSWORD=secret
+# SMTP_FROM=noreply@example.com
+# SMTP_MODE=tls