nagayon-935 / mping / 26717572175

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main: 83%

Pull #26

github

feat: add configurable colour-coding/alert thresholds

Externalise the previously hardcoded RTT/Jitter/Loss colour boundaries
into a ui.Thresholds value that can be set via CLI flags or the YAML
hosts file. warn = orange boundary, crit = red boundary.

- ui.Thresholds type with DefaultThresholds() and Validate() (warn < crit,
  sane ranges); package-level activeThresholds applied once at Run() start
- RunOptions.Thresholds threads the config into the TUI
- CLI flags: --rtt-warn/--rtt-crit, --jitter-warn/--jitter-crit,
  --loss-warn/--loss-crit (defaults match previous constants)
- YAML: thresholds: block (rtt-warn, rtt-crit, jitter-warn, jitter-crit,
  loss-warn, loss-crit), CLI flags override YAML
- Validation at startup and on YAML reload (validateHostsDoc)
- Tests for Validate(), colour fns under custom thresholds, flag/YAML
  precedence, and reload validation
- README.md / README.ja.md updated (Options table, usage example,
  hosts.yaml block, colour-coding notes)

Behaviour is unchanged by default — all defaults equal the prior constants.

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