Add timezone-aware event scheduling (default Australia/Sydney)

[benrobson]

Motivation

• Interpret event dates (reveal, redemption start/end) in a configurable timezone so scheduling behaves correctly across servers.
• Default the event timezone to Australia/Sydney as the expected default for this deployment.
• Surface times with timezone information in player-facing messages for clarity.
• Allow server admins to change the event timezone via a single config key event-timezone.

Description

• Converted date handling to use ZonedDateTime throughout and parse ISO local datetimes then attach the configured zone via DateUtils.getEventZoneId().
• Added event-timezone to config.yml (default Australia/Sydney) and updated DateUtils to fall back to this default when invalid.
• Updated FormatterUtils and date formatters to include time and zone (pattern d MMMM yyyy HH:mm z) and adjusted formatted output methods to use ZonedDateTime.
• Documented the new event-timezone option and timezone behavior in README.md.

Testing

• No automated tests were executed for this change during the rollout.
• CI/test suite was not triggered as part of this update.

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Codex Task

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/add-timezone-support-for-events

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