feat(eidas): Implement eIDAS Crypto Plugin with dependency injection and signing capabilities

- Added ServiceCollectionExtensions for eIDAS crypto providers.
- Implemented EidasCryptoProvider for handling eIDAS-compliant signatures.
- Created LocalEidasProvider for local signing using PKCS#12 keystores.
- Defined SignatureLevel and SignatureFormat enums for eIDAS compliance.
- Developed TrustServiceProviderClient for remote signing via TSP.
- Added configuration support for eIDAS options in the project file.
- Implemented unit tests for SM2 compliance and crypto operations.
- Introduced dependency injection extensions for SM software and remote plugins.

src/Scanner/StellaOps.Scanner.Worker/Processing/PoE/PoEGenerationStageExecutor.cs

@@ -9,7 +9,7 @@ using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using StellaOps.Scanner.Core.Configuration;
 using StellaOps.Scanner.Core.Contracts;
-using StellaOps.Scanner.Reachability.Models;
+using StellaOps.Attestor;
 using StellaOps.Scanner.Worker.Orchestration;
 
 namespace StellaOps.Scanner.Worker.Processing.PoE;
@@ -138,7 +138,7 @@ public sealed class PoEGenerationStageExecutor : IScanStageExecutor
         }
     }
 
-    private ScanContext BuildScanContext(ScanJobContext context)
+    private PoEScanContext BuildScanContext(ScanJobContext context)
     {
         // Extract scan metadata from job context
         var scanId = context.ScanId;
@@ -169,7 +169,7 @@ public sealed class PoEGenerationStageExecutor : IScanStageExecutor
         // Get configuration path
         var configPath = "etc/scanner.yaml"; // Default
 
-        return new ScanContext(
+        return new PoEScanContext(
             ScanId: scanId,
             GraphHash: graphHash ?? "blake3:unknown",
             BuildId: buildId ?? "gnu-build-id:unknown",