- Introduced new API endpoints for creating, retrieving, amending, and listing CVSS receipts. - Updated IPolicyEngineClient interface to include methods for CVSS receipt operations. - Implemented PolicyEngineClient to handle CVSS receipt requests. - Enhanced Program.cs to map new CVSS receipt routes with appropriate authorization. - Added necessary models and contracts for CVSS receipt requests and responses. - Integrated Postgres document store for managing CVSS receipts and related data. - Updated database schema with new migrations for source documents and payload storage. - Refactored existing components to support new CVSS functionality.