feat(monitors) Add 20 new monitors, config system, health endpoints, …

[Paulius0112]

…and Grafana dashboard

• Add comprehensive Linux monitoring with 20 new monitors:

  • CPU: cpu_stat, loadavg, cpufreq, cpuidle, schedstat
  • Memory: vmstat, zoneinfo, buddyinfo, slabinfo
  • Process: proc_extended (unified process metrics)
  • Network: netstat, sockstat, netinfo
  • Block I/O: blkqueue, blkinflight
  • System: entropy, fs_stats, uptime, thermal
  • cgroup: v1/v2 auto-detection with CPU/memory/IO/PIDs metrics

• Add infrastructure improvements:

  • TOML config file support (--config flag)
  • CLI flags for port (--port) and bind address (--bind)
  • Health endpoint (/health) and readiness endpoint (/ready)
  • Graceful shutdown on SIGTERM/SIGINT
  • Shared parser utilities (src/parsers.rs)

• Add deployment and visualization:

  • Grafana dashboard with 20+ panels (examples/grafana-dashboard.json)
  • Docker Compose setup with Prometheus and Grafana (deploy/)
  • Sample config file (examples/proctap.toml)

• Add tests:

  • Integration tests for all parsing formats
  • Test fixtures with sample proc/sys data
  • Unit tests for parser utilities