DNS lookup may fail for tracker URIs with paths

[coderabbitai]

Description

The current implementation in UdpTracker::new uses lookup_host(&uri.replace("udp://", "")) which may include URL paths (e.g., /announce) and cause DNS resolution to fail.

Location

File: crates/libtortillas/src/tracker/udp.rs, lines 548-557

Context

This issue was identified during review of PR #160 but is out of scope for that refactoring effort.

References

• PR: refactor: Cleanup & refactor logs with error management fixes #160
• Comment: refactor: Cleanup & refactor logs with error management fixes #160 (comment)
• Requested by: @artrixdotdev