Optimize base64 storage in files to support concurrent storage (#2856)

* fix: variables check

* remove log

* perf: file img saved

* update doc

docSite/content/zh-cn/docs/faq/docker.md

@@ -0,0 +1,10 @@
+---
+title: 'Docker 部署问题'
+description: 'FastGPT Docker 部署问题'
+icon: ''
+draft: false
+toc: true
+weight: 901
+type: redirect
+target: /docs/development/docker/#faq
+---