v0.3.5

Update proxer-cli to version 0.3.5 and refactor error logging

• Bump version of proxer-cli in Cargo.toml and Cargo.lock from 0.3.4 to 0.3.5.
• Refactor error logging in src/server/proxy.rs to use a new tracing_error utility function for improved readability and consistency in error messages.

Full Changelog: v0.3.4...v0.3.5