feat(preshared_key): increase post quantum robustness by providing a preshared key for wg connection

[esterlus]

feat(status): status check now returns load averages and nprocs alongside usage stats
chore(deps): update to latest tooling and deps

[Copilot]

Pull request overview

This PR enhances WireGuard security by implementing preshared keys for post-quantum robustness, expands status monitoring to include system load metrics, and updates project dependencies.

Changes:

• Implemented preshared key generation and configuration for WireGuard peers
• Extended status endpoint to report load averages (1, 5, 15 minutes) and processor count
• Updated Rust toolchain from 1.91 to 1.93 and dependencies (toml 0.8→0.9, nixfmt package)

Reviewed changes

Copilot reviewed 7 out of 9 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/wg/show.rs	Updated test data to include preshared keys and added assertions for preshared key validation
src/wg/set.rs	Modified add_peer to generate preshared keys, write them to temporary files, and return the key value
src/status.rs	Added load average and nproc metrics collection via /proc/loadavg and nproc command
src/register.rs	Updated registration flow to include preshared key in response
rust-toolchain.toml	Bumped Rust toolchain version to 1.93
flake.nix	Updated Nix formatter package reference and reformatted attribute sets
Cargo.toml	Bumped version to 0.3.0 and updated toml dependency to 0.9

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