chore: scaffold ignore rules and environment templates

Keep secrets and build artifacts out of the tree so the repo is safe to publish.

.env.prod.example

@@ -0,0 +1,33 @@
+# Production compose secrets — copy to .env.prod (never commit).
+#   ./scripts/compose-prod.sh up -d --build
+
+POSTGRES_USER=pargar
+POSTGRES_DB=pargar
+POSTGRES_PASSWORD=replace-with-strong-postgres-password
+REDIS_PASSWORD=replace-with-strong-redis-password
+RUSTFS_ACCESS_KEY=replace-with-rustfs-access-key
+RUSTFS_SECRET_KEY=replace-with-long-rustfs-secret
+STORAGE_REGION=us-east-1
+STORAGE_BUCKET=pargar
+JWT_SECRET=replace-with-at-least-32-random-characters
+ADMIN_PASSWORD=replace-with-strong-admin-password
+ADMIN_NAME=Admin
+ADMIN_USERNAME=admin
+ADMIN_EMAIL=admin@example.com
+
+# Public DNS hostname (Let's Encrypt HTTP-01 must reach this host on :80)
+DOMAIN=app.example.com
+ACME_EMAIL=ops@example.com
+PUBLIC_URL=https://app.example.com
+FRONTEND_ORIGINS=https://app.example.com
+
+DEV_MODE=false
+SEED_CURRICULUM=false
+METRICS_TOKEN=replace-with-metrics-scrape-token
+# TRUSTED_PROXY_CIDRS=10.0.0.0/8,172.16.0.0/12,192.168.0.0/16
+
+DONATION_ENABLED=true
+# Enable only when offline payment ops are ready.
+PHYSICAL_CERT_ENABLED=false
+PHYSICAL_CERT_PRICE_IRR=2500000
+PHYSICAL_CERT_WINDOW_DAYS=30