docs: add comprehensive contributing guide for DaemonEye (#160)

Update documentation for
#155

Add a complete contributing guide covering setup, development
environment, code standards, testing requirements, PR process, and
community guidelines. This guide provides contributors with detailed
instructions on Rust coding standards, GPG commit signing, workspace
configuration, documentation practices, and the complete development
workflow for DaemonEye.

_Generated by [Dosu](https://dosu.dev)_

Co-authored-by: dosubot[bot] <131922026+dosubot[bot]@users.noreply.github.com>

Author: dosubot[bot]

docs/src/contributing.md

@@ -96,7 +96,7 @@ tokio = { version = "1.0", features = ["full"] }
 clap = { version = "4.6.0", features = ["derive", "completion"] }
 serde = { version = "1.0", features = ["derive"] }
 sqlx = { version = "0.7", features = ["runtime-tokio-rustls", "sqlite"] }
-sysinfo = "0.30"
+sysinfo = "0.38.4"
 tracing = "0.1"
 thiserror = "1.0"
 anyhow = "1.0"