Fix OPC UA adapter: pass connection details, certificate stores, endpoint discovery

- DataConnectionActor now stores and passes connection details to adapter ConnectAsync
- DataConnectionManagerActor passes connection details when creating actor
- RealOpcUaClient uses DiscoveryClient for endpoint selection with no-security preference
- Added certificate trust store paths to prevent TrustedIssuerCertificates error
- Sanitize connection names for Akka actor paths (replace spaces)

src/ScadaLink.DataConnectionLayer/Adapters/RealOpcUaClient.cs

@@ -26,7 +26,10 @@ public class RealOpcUaClient : IOpcUaClient
             SecurityConfiguration = new SecurityConfiguration
             {
                 AutoAcceptUntrustedCertificates = true,
-                ApplicationCertificate = new CertificateIdentifier()
+                ApplicationCertificate = new CertificateIdentifier(),
+                TrustedIssuerCertificates = new CertificateTrustList { StorePath = Path.Combine(Path.GetTempPath(), "ScadaLink", "pki", "issuers") },
+                TrustedPeerCertificates = new CertificateTrustList { StorePath = Path.Combine(Path.GetTempPath(), "ScadaLink", "pki", "trusted") },
+                RejectedCertificateStore = new CertificateTrustList { StorePath = Path.Combine(Path.GetTempPath(), "ScadaLink", "pki", "rejected") }
             },
             ClientConfiguration = new ClientConfiguration { DefaultSessionTimeout = 60000 },
             TransportQuotas = new TransportQuotas { OperationTimeout = 15000 }
@@ -35,11 +38,26 @@ public class RealOpcUaClient : IOpcUaClient
         await appConfig.ValidateAsync(ApplicationType.Client);
         appConfig.CertificateValidator.CertificateValidation += (_, e) => e.Accept = true;
 
-        var endpoint = new EndpointDescription(endpointUrl)
+        // Discover endpoints from the server, pick the no-security one
+        EndpointDescription? endpoint;
+        try
         {
-            SecurityMode = MessageSecurityMode.None,
-            SecurityPolicyUri = SecurityPolicies.None
-        };
+#pragma warning disable CS0618
+            using var discoveryClient = DiscoveryClient.Create(new Uri(endpointUrl));
+#pragma warning restore CS0618
+#pragma warning disable CS0618
+            var endpoints = discoveryClient.GetEndpoints(null);
+#pragma warning restore CS0618
+            endpoint = endpoints
+                .Where(e => e.SecurityMode == MessageSecurityMode.None)
+                .FirstOrDefault() ?? endpoints.FirstOrDefault();
+        }
+        catch
+        {
+            // Fallback: construct endpoint description manually
+            endpoint = new EndpointDescription(endpointUrl);
+        }
+
         var endpointConfig = EndpointConfiguration.Create(appConfig);
         var configuredEndpoint = new ConfiguredEndpoint(null, endpoint, endpointConfig);