Refa: enlarge http body size. (#6100)

### What problem does this PR solve?



### Type of change


- [x] Refactoring

docker/.env

@@ -126,8 +126,8 @@ TIMEZONE='Asia/Shanghai'
 # MACOS=1
 
 # The maximum file size for each uploaded file, in bytes.
-# You can uncomment this line and update the value if you wish to change the 128M file size limit
-# MAX_CONTENT_LENGTH=134217728
+# You can uncomment this line and update the value if you wish to change the 1024M file size limit
+# MAX_CONTENT_LENGTH=1073741824
 # After making the change, ensure you update `client_max_body_size` in nginx/nginx.conf correspondingly.
 
 # The log level for the RAGFlow's owned packages and imported packages.