feat: implement transferWorkflow operation in n8n_update_partial_workflow (#644) (#649)

Add transferWorkflow diff operation to move workflows between n8n projects:
- TransferWorkflowOperation type with destinationProjectId field
- WorkflowDiffEngine validates and tracks transfer intent
- Handler calls PUT /workflows/{id}/transfer after update
- N8nApiClient.transferWorkflow() method
- Zod schema validates destinationProjectId is non-empty
- Tool description and documentation updated
- inferIntentFromOperations case for transfer

Also fixes two pre-existing bugs found during review:
- continueOnError path now properly extracts/propagates activation flags
- Debug log in updateConnectionReferences shows correct old name

Based on work by @djakielski in PR #645.


Conceived by Romuald Członkowski - https://www.aiadvisors.pl/en

src/services/n8n-api-client.ts

@@ -252,6 +252,14 @@ export class N8nApiClient {
     }
   }
 
+  async transferWorkflow(id: string, destinationProjectId: string): Promise<void> {
+    try {
+      await this.client.put(`/workflows/${id}/transfer`, { destinationProjectId });
+    } catch (error) {
+      throw handleN8nApiError(error);
+    }
+  }
+
   async activateWorkflow(id: string): Promise<Workflow> {
     try {
       const response = await this.client.post(`/workflows/${id}/activate`, {});