[Performance] Reconnection Without Exponential Backoff

[unn-Known1]

📋 Description

Auto-reconnection hammers server with rapid attempts - no backoff strategy.

📍 Location

web/vnc.html (lines 284-286)

🔄 Current Behavior

Fixed 1s reconnect delay.

✅ Expected Behavior

Implement exponential backoff: 1s, 2s, 4s, 8s, max 60s.

🎯 Priority

Medium