feat: add network, process, and system info collectors

[dev-dami]

Summary

Adds three new metric collectors that turn gim from a basic CPU/memory/disk tool into something worth actually using.

• network — enumerates all network interfaces via sysinfo's Networks API, reports total rx/tx bytes and per-interface breakdown
• process — snapshots all running processes, reports total count and top 5 by memory and CPU usage (name, pid, value)
• system — reports OS name, version, kernel, hostname, arch, uptime (seconds + human readable), and 1/5/15m load averages

All three implement the existing MetricCollector trait so they slot into the engine and both frontends without changes. mod.rs updated to export them.

Commits

1. feat(modules): add network interface traffic collector
2. feat(modules): add process collector with top-5 by memory and CPU
3. feat(modules): add system info collector with OS, uptime, and load
4. feat(modules): register network, process, and system in mod.rs

Summary by CodeRabbit

• New Features
  • Added network metrics monitoring to track interface activity, bytes received and transmitted, and interface count details.
  • Added process metrics monitoring to display the top-5 processes ranked by memory and CPU usage.
  • Added system metrics reporting including OS name and version, kernel information, hostname, CPU architecture, uptime, and load averages.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Caution

Review failed

The pull request is closed.

📝 Walkthrough

Walkthrough

The pull request adds three new metric collector modules—network, process, and system—to gather runtime statistics. The module declarations are updated to expose these collectors publicly, with memory module reordered in the declaration list.

Changes

Cohort / File(s)	Summary
Module Declarations src/modules/mod.rs	Reordered public module declarations; added three new public module exports: network, process, and system alongside existing cpu and disk modules.
New Metric Collectors src/modules/network.rs, src/modules/process.rs, src/modules/system.rs	Introduced three new metric collector implementations each with a public struct and new() constructor that implement the MetricCollector trait. Network collects interface statistics, process gathers top-5 CPU and memory consumers, and system captures OS and hardware information.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Poem

🐰 Three collectors hop through the code,
Network, process, system load,
Each one metrics swift collect,
Data flowing, all correct! 📊
Into mod.rs they blend,
On this journey, code will mend. ✨

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/new-modules

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[dev-dami]

Reviewed all 4 commits: network collector with interface enumeration, process collector with top-5 sorting, system info collector with OS/uptime/load, and mod.rs registration. Implementation follows existing collector patterns (returns Vec, uses sysinfo refresh). LGTM.