fix(wire-dto): give ExistingOntologyMergeAdd its own @JsonTypeName

ExistingOntologyMergeAddAction/Result shared @JsonTypeName (and CHANNEL)
"webprotege.ontologies.MergeOntologies" with MergeOntologiesAction — an ambiguous
polymorphic-subtype collision. Retag the existing-merge pair to
"webprotege.ontologies.ExistingOntologyMergeAdd" so each merge operation has a distinct
wire identity; MergeOntologiesAction keeps "webprotege.ontologies.MergeOntologies".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: johardi

src/main/java/edu/stanford/protege/webprotege/merge_add/ExistingOntologyMergeAddAction.java

@@ -13,14 +13,14 @@
 
 
 
-@JsonTypeName("webprotege.ontologies.MergeOntologies")
+@JsonTypeName("webprotege.ontologies.ExistingOntologyMergeAdd")
 public record ExistingOntologyMergeAddAction(@JsonProperty("changeRequestId") ChangeRequestId changeRequestId,
                                              @JsonProperty("projectId") ProjectId projectId,
                                              @JsonProperty("documentId") DocumentId documentId,
                                              @JsonProperty("selectedOntologies") List<OWLOntologyID> selectedOntologies,
                                              @JsonProperty("targetOntology") OWLOntologyID targetOntology) implements ProjectAction<ExistingOntologyMergeAddResult>, ContentChangeRequest {
 
-    public static final String CHANNEL = "webprotege.ontologies.MergeOntologies";
+    public static final String CHANNEL = "webprotege.ontologies.ExistingOntologyMergeAdd";
 
     @Override
     public String getChannel() {

src/main/java/edu/stanford/protege/webprotege/merge_add/ExistingOntologyMergeAddResult.java

@@ -5,7 +5,7 @@
 
 
 
-@JsonTypeName("webprotege.ontologies.MergeOntologies")
+@JsonTypeName("webprotege.ontologies.ExistingOntologyMergeAdd")
 public record ExistingOntologyMergeAddResult() implements Result {
 
 }