feat #3910: enhance IP detection method to prioritize local interface…

[NabiKAZ]

What is the pull request?

Fix #3910 - Add local network interface IP detection to avoid proxy interference. Now detects IP via ip addr first, falls back to external services, and allows user to manually override the detected IP.
About get SSL certificate.

Which part of the application is affected by the change?

• Frontend
• Backend

Type of Changes

• Bug fix
• New feature
• Refactoring
• Other

Screenshots

[INF] Starting automatic SSL certificate generation for server IP...
[INF] Using Let's Encrypt shortlived profile (~6 days validity, auto-renews)
[INF] Server IP detected: 1.1.1.1
Press Enter to use this IP, or type a different IP:

[cherts]

Hi

If the server has several network interfaces, then we must first find out through which interface the default route is set and only then take its IP address, something like this (debian/ubuntu/rhel/alpine is supported this method)

ip -o -4 addr list $(ip route show default 2>/dev/null | awk '/default/ {print $5}') 2>/dev/null | awk '{print $4}' | cut -d/ -f1 | head -1