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>

config.py

@@ -32,7 +32,7 @@ class Config:
     LOGS_DIR = BASE_DIR / "logs"
 
     # Supported file types
-    SUPPORTED_EXTENSIONS = {".xlsx", ".docx", ".pptx"}
+    SUPPORTED_EXTENSIONS = {".xlsx", ".docx", ".pptx", ".pdf"}
 
     # ============== Rate Limiting (SaaS) ==============
     RATE_LIMIT_ENABLED = os.getenv("RATE_LIMIT_ENABLED", "true").lower() == "true"