feat(dcl): bounded recursive OPC UA address-space search adapter (T15)

src/ZB.MOM.WW.ScadaBridge.DataConnectionLayer/Adapters/OpcUaDataConnection.cs

@@ -17,7 +17,7 @@ namespace ZB.MOM.WW.ScadaBridge.DataConnectionLayer.Adapters;
 /// - Read/Write → Read/Write service calls
 /// - Quality → OPC UA StatusCode mapping
 /// </summary>
-public class OpcUaDataConnection : IDataConnection, IBrowsableDataConnection, IAlarmSubscribableConnection
+public class OpcUaDataConnection : IDataConnection, IBrowsableDataConnection, IAlarmSubscribableConnection, IAddressSpaceSearchable
 {
     private readonly IOpcUaClientFactory _clientFactory;
     private readonly ILogger<OpcUaDataConnection> _logger;
@@ -302,6 +302,19 @@ public class OpcUaDataConnection : IDataConnection, IBrowsableDataConnection, IA
         CancellationToken cancellationToken = default)
         => _client!.BrowseChildrenAsync(parentNodeId, continuationToken, cancellationToken);
 
+    /// <inheritdoc />
+    public Task<AddressSpaceSearchResult> SearchAddressSpaceAsync(
+        string query, int maxDepth, int maxResults, CancellationToken cancellationToken = default)
+    {
+        // Guard connection state with the typed ConnectionNotConnectedException so
+        // the site-side handler can map it uniformly (mirrors BrowseChildrenAsync,
+        // whose underlying client throws the same type when the session is down).
+        if (_client == null || !_client.IsConnected)
+            throw new ConnectionNotConnectedException("OPC UA client is not connected.");
+
+        return _client.SearchAddressSpaceAsync(query, maxDepth, maxResults, cancellationToken);
+    }
+
     /// <inheritdoc />
     public async Task<bool> WriteBatchAndWaitAsync(
         IDictionary<string, object?> values, string flagPath, object? flagValue,