feat(server): add -stats-interval flag

[TheHuman00]

I run this server on my own infrastructure and the default 60s stats log cadence is too frequent for my setup. This adds a -stats-interval flag to make it configurable.

Changes

• New -stats-interval flag (default 60s)
• statsLoop reads the flag directly, instead of a separate global variable
• Validation rejects zero/negative values
• README and tests updated

Thanks for maintaining this project, I use it daily and it works great. 😄

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a configurable stats logging cadence to the roughtime server by promoting the interval to a CLI flag and wiring it through runtime behavior and validation.

Changes:

• Introduces -stats-interval duration flag with validation for positive values.
• Updates statsLoop and server config logging to use the flag value.
• Updates tests and README to reflect the new flag behavior.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
cmd/roughtime/main.go	Adds -stats-interval flag, validates it, and logs configured value.
cmd/roughtime/stats.go	Switches periodic ticker/logging to use the flag-backed interval.
cmd/roughtime/stats_test.go	Updates interval override to target the flag-backed duration.
cmd/roughtime/main_test.go	Ensures flag global statsIntervalFlag is restored after tests.
cmd/roughtime/bootstrap_test.go	Adds validation tests for zero/negative stats interval.
README.md	Documents the new -stats-interval flag.

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