[BUG] Server binds to IPv6 when using 'localhost' instead of '127.0.0.1' (v4 vs vs6)

[nikitastryuk]

Description

This change updated BUCKET_HOST default value and now server binds to IPv6 (::1) instead of IPv4 (127.0.0.1). This behavior occurs because 'localhost' can resolve to both IPv4 and IPv6 addresses, and the system's default behavior is to prefer IPv6.

Current Behavior for BUCKET_HOST:

• Using 127.0.0.1: IPv4
• Using localhost: IPv6

Proposed Solution

• Revert BUCKET_HOST change to use 127.0.0.1
• Make the server binding code to explicitly use IPv4

Workaround

• Using BUCKET_HOST=127.0.0.1 in .env

[nikitastryuk]

cc @YaroslavLitvinov

[rampage644]

I also noticed opening app with http://127.0.0.1:8080 causes requests to fail due to CORS. Using localhost:8080 works.