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

dist/services/n8n-api-client.d.ts

@@ -20,6 +20,7 @@ export declare class N8nApiClient {
     getWorkflow(id: string): Promise<Workflow>;
     updateWorkflow(id: string, workflow: Partial<Workflow>): Promise<Workflow>;
     deleteWorkflow(id: string): Promise<Workflow>;
+    transferWorkflow(id: string, destinationProjectId: string): Promise<void>;
     activateWorkflow(id: string): Promise<Workflow>;
     deactivateWorkflow(id: string): Promise<Workflow>;
     listWorkflows(params?: WorkflowListParams): Promise<WorkflowListResponse>;