Shorten descriptions to fit command length limit

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PR Summary

Low Risk
Changes are mostly validation, test infrastructure, and shorter Discord UI copy; registration now fails fast instead of silently on Discord API errors.

Overview
Keeps slash commands under Discord’s 8000-character combined limit so bulk registration no longer fails with APPLICATION_COMMAND_TOO_LARGE.

Adds command-size.utils and blocks registerCommands when any built command is oversized, with a clear error listing offenders. Vitest (commands.test.ts) asserts every command builds, stays under the limit, and has unique names; db.ts uses an in-memory SQLite DB when VITEST is set so loading the command graph does not touch data/main.sqlite.

/events add/set option descriptions for announcement, room ping, and Discord event templates are shortened to point admins at /events help instead of long inline placeholder lists. Removes a duplicate VoiceCommand entry in commands.loader.ts (also covered by the duplicate-name test).

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