feat: Add CVSS receipt management endpoints and related functionality

- 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.

src/Concelier/__Libraries/StellaOps.Concelier.Connector.Vndr.Cisco/CiscoConnector.cs

@@ -163,7 +163,7 @@ public sealed class CiscoConnector : IFeedConnector
                             BuildMetadata(advisory),
                             Etag: null,
                             LastModified: advisory.LastUpdated ?? advisory.FirstPublished ?? now,
-                            GridFsId: gridFsId,
+                            PayloadId: gridFsId,
                             ExpiresAt: null);
 
                         var upserted = await _documentStore.UpsertAsync(record, cancellationToken).ConfigureAwait(false);
@@ -259,7 +259,7 @@ public sealed class CiscoConnector : IFeedConnector
                 continue;
             }
 
-            if (!document.GridFsId.HasValue)
+            if (!document.PayloadId.HasValue)
             {
                 _diagnostics.ParseFailure();
                 _logger.LogWarning("Cisco document {DocumentId} missing GridFS payload", documentId);
@@ -273,7 +273,7 @@ public sealed class CiscoConnector : IFeedConnector
             byte[] payload;
             try
             {
-                payload = await _rawDocumentStorage.DownloadAsync(document.GridFsId.Value, cancellationToken).ConfigureAwait(false);
+                payload = await _rawDocumentStorage.DownloadAsync(document.PayloadId.Value, cancellationToken).ConfigureAwait(false);
             }
             catch (Exception ex)
             {