feat: homelab deployment - NPM + IONOS DNS + monitoring + NAS backup

- Restructured docker-compose for Nginx Proxy Manager (no custom nginx)
- Added domain wordly.art configuration
- Added Prometheus + Grafana monitoring stack with pre-configured dashboards
- Added PostgreSQL backup script to NAS (daily/weekly/monthly rotation)
- Added alert rules for backend, system, and Docker metrics
- Updated deployment guide for NPM + IONOS DNS homelab setup
- Added marketing plan document
- PDF translator and watermark support
- Enhanced middleware, routes, and translator modules

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

database/models.py

@@ -100,7 +100,7 @@ class User(Base):
     api_keys = relationship("ApiKey", back_populates="user", lazy="select")
 
     __table_args__ = (
-        CheckConstraint("tier IN ('free', 'pro')", name="ck_users_tier"),
+        CheckConstraint("tier IN ('free', 'starter', 'pro', 'business', 'enterprise')", name="ck_users_tier"),
         Index("ix_users_email_active", "email", "is_active"),
         Index("ix_users_stripe_customer", "stripe_customer_id"),
     )