chore: update n8n to 2.6.3 and bump version to 2.33.6

- Updated n8n from 2.4.4 to 2.6.3
- Updated n8n-core from 2.4.2 to 2.6.1
- Updated n8n-workflow from 2.4.2 to 2.6.0
- Updated @n8n/n8n-nodes-langchain from 2.4.3 to 2.6.2
- Rebuilt node database with 806 nodes (544 from n8n-nodes-base, 262 from @n8n/n8n-nodes-langchain)
- Re-fetched 398 community nodes (331 verified, 67 from npm)
- Updated README badge with new n8n version
- Updated CHANGELOG with dependency changes

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

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

dist/telemetry/batch-processor.d.ts

@@ -12,6 +12,8 @@ export declare class TelemetryBatchProcessor {
     private flushTimes;
     private deadLetterQueue;
     private readonly maxDeadLetterSize;
+    private eventListeners;
+    private started;
     constructor(supabase: SupabaseClient | null, isEnabled: () => boolean);
     start(): void;
     stop(): void;