V4.15.6

📦 Upgrade Guide

Image Changes

• Update the fastgpt-app (FastGPT core service) image tag to v4.15.6.
• Update the fastgpt-pro (FastGPT commercial edition) image tag to v4.15.6.

🐛 Fixes

1. Fixed chat history failing to load when opening a conversation page directly from a link for the first time.