Replace raw `Error` with `UserError` for user-facing conditions (invalid trade state, user not found, permission/channel type checks) and `SystemError` for internal failures (DB insert failures, external API errors, missing config). Improves Discord UX by ensuring user-facing errors are surfaced cleanly via withCommandErrorHandling.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- Move instance properties to module-level state (channelActivity, channelCooldowns)
- Convert constructor cleanup interval to module-level initialization
- Export state variables for testing
- Update tests to use direct state access instead of (service as any)
- Maintains same behavior while following project service pattern
Closes#4
- Update all commands and events to fetch guild config once per execution
- Pass config to service methods that need it (ModerationService.issueWarning)
- Update terminal service to use guildSettingsService for persistence
- Remove direct imports of config for guild-specific settings
This consolidates configuration to database-backed guild settings,
eliminating the dual config system.
