v0.3.4

Update proxer-cli to version 0.3.4 and improve error logging

• Bump version of proxer-cli in Cargo.toml and Cargo.lock from 0.3.3 to 0.3.4.
• Enhance error logging in src/server/proxy.rs by adding color formatting to error messages for better visibility.
• Refactor connection limit handling in src/server/mod.rs to simplify the logic and improve clarity.

Full Changelog: v0.3.3...v0.3.4