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/workflow-diff-engine.d.ts

@@ -7,6 +7,7 @@ export declare class WorkflowDiffEngine {
     private removedNodeNames;
     private tagsToAdd;
     private tagsToRemove;
+    private transferToProjectId;
     applyDiff(workflow: Workflow, request: WorkflowDiffRequest): Promise<WorkflowDiffResult>;
     private validateOperation;
     private applyOperation;
@@ -36,6 +37,8 @@ export declare class WorkflowDiffEngine {
     private validateDeactivateWorkflow;
     private applyActivateWorkflow;
     private applyDeactivateWorkflow;
+    private validateTransferWorkflow;
+    private applyTransferWorkflow;
     private validateCleanStaleConnections;
     private validateReplaceConnections;
     private applyCleanStaleConnections;