Add vulnerability scanner and WebSocket manager for scan notifications

- Implemented VulnerabilityScanner class to scan images for vulnerabilities using Trivy and NVD API.
- Added methods to parse and store vulnerability data in the database.
- Created WebSocketManager class to handle real-time notifications for scan status updates.
- Integrated WebSocket notifications for scan start, completion, and failure events.

.gitignore

@@ -8,3 +8,6 @@ wheels/
 
 # Virtual environments
 .venv
+
+*.db
+.env