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/Policy/StellaOps.Policy.Engine/Program.cs

@@ -131,6 +131,25 @@ builder.Services.AddSingleton<PolicyEngineStartupDiagnostics>();
 builder.Services.AddSingleton<PolicyTimelineEvents>();
 builder.Services.AddSingleton<EvidenceBundleService>();
 builder.Services.AddSingleton<PolicyEvaluationAttestationService>();
+
+// Verdict attestation services
+builder.Services.AddSingleton<StellaOps.Policy.Engine.Attestation.VerdictPredicateBuilder>();
+builder.Services.AddHttpClient<StellaOps.Policy.Engine.Attestation.IAttestorClient, StellaOps.Policy.Engine.Attestation.HttpAttestorClient>();
+builder.Services.AddSingleton<StellaOps.Policy.Engine.Attestation.VerdictAttestationOptions>(sp =>
+{
+    var options = new StellaOps.Policy.Engine.Attestation.VerdictAttestationOptions
+    {
+        Enabled = false, // Disabled by default, enable via config
+        FailOnError = false,
+        RekorEnabled = false,
+        AttestorUrl = "http://localhost:8080",
+        Timeout = TimeSpan.FromSeconds(30)
+    };
+    // TODO: Bind from configuration section "VerdictAttestation"
+    return options;
+});
+builder.Services.AddSingleton<StellaOps.Policy.Engine.Attestation.IVerdictAttestationService, StellaOps.Policy.Engine.Attestation.VerdictAttestationService>();
+
 builder.Services.AddSingleton<IncidentModeService>();
 builder.Services.AddSingleton<RiskProfileConfigurationService>();
 builder.Services.AddSingleton<StellaOps.Policy.RiskProfile.Lifecycle.RiskProfileLifecycleService>();