feat: resolved URI display and drill-down for TO/TO_DYNAMIC nodes

- Show resolved endpoint URI as teal italic line on diagram nodes
  when execution overlay is active
- Enable drill-down for TO and TO_DYNAMIC nodes (not just DIRECT/SEDA)
- Use runtime resolvedEndpointUri from execution overlay for drill-down
  when static endpointUri doesn't match
- Increase node height from 50px to 56px to accommodate the third line

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

cameleer3-server-app/src/main/java/com/cameleer3/server/app/diagram/ElkDiagramRenderer.java

@@ -53,7 +53,7 @@ public class ElkDiagramRenderer implements DiagramRenderer {
     }
 
     private static final int PADDING = 20;
-    private static final int NODE_HEIGHT = 50;
+    private static final int NODE_HEIGHT = 56;
     private static final int NODE_WIDTH = 220;
     private static final int COMPOUND_TOP_PADDING = 30;
     private static final int COMPOUND_SIDE_PADDING = 10;