feat: enhance production readiness with environment configuration, dependency checks, and sitemap updates

.env.example

@@ -3,6 +3,9 @@ FLASK_ENV=development
 FLASK_DEBUG=1
 SECRET_KEY=change-me-in-production
 
+# Site Domain (used in sitemap, robots.txt, emails)
+SITE_DOMAIN=https://saas-pdf.com
+
 # Redis
 REDIS_URL=redis://redis:6379/0
 
@@ -31,6 +34,23 @@ DATABASE_PATH=/app/data/saas_pdf.db
 # CORS
 CORS_ORIGINS=http://localhost:5173,http://localhost:3000
 
+# Stripe Payments
+STRIPE_SECRET_KEY=sk_test_XXXXXXXXXXXXXXXXXXXXXXXX
+STRIPE_WEBHOOK_SECRET=whsec_XXXXXXXXXXXXXXXXXXXXXXXX
+STRIPE_PRICE_ID_PRO_MONTHLY=price_XXXXXXXXXXXXXXXX
+STRIPE_PRICE_ID_PRO_YEARLY=price_XXXXXXXXXXXXXXXX
+
+# Sentry Error Monitoring
+SENTRY_DSN=
+SENTRY_ENVIRONMENT=development
+
+# PostgreSQL (production) — leave empty to use SQLite
+DATABASE_URL=
+
+# Frontend
+VITE_SITE_DOMAIN=https://saas-pdf.com
+VITE_SENTRY_DSN=
+
 # Frontend Analytics / Ads (Vite)
 VITE_GA_MEASUREMENT_ID=G-XXXXXXXXXX
 VITE_PLAUSIBLE_DOMAIN=