Implement command cooldown management and enhance command execution flow

- Introduced `applyCommandCooldown` function to manage per-command cooldowns after execution, improving command rate limiting.
- Updated command execution flow to include cooldown application, ensuring users are informed of cooldown status.
- Enhanced error handling in interaction replies, allowing for more graceful error management and user feedback.
- Improved the handling of interaction responses across various commands, ensuring consistent user experience.
- Added permission checks for new commands, ensuring only authorized users can execute specific actions.

docs/PHASE-TRACKING.md

@@ -272,6 +272,29 @@
 - [ ] `/giveaway end` mit falscher ID → Fehlermeldung; mit korrekter ID → Reroll möglich
 - [ ] Dashboard „Jetzt beenden“ → Status beendet, Discord-Nachricht aktualisiert
 
+## Post-Phase – Audit Remediation (Reliability + Security) (Status: implementiert)
+
+### Abgeschlossen (Code)
+
+- Scheduler: Self-Remove des aktiven Jobs entfernt; safeRemove für externe Cancels
+- Channel-Picker: Fehler/leere Responses nicht cachen; Error+Reload wie Rollen
+- `requirePermission`: Member- vs. Bot-Permissions getrennt; Defer auf Ban/Purge/Lock/Backup/Giveaway/Media/Translate
+- Giveaway: atomares End (`updateMany`), Pause cancel/reschedule, Dashboard Pause/Delete via BullMQ
+- Component-/Context-Gates: Maintenance + Modul-Toggle
+- Owner-Guild-Bypass ab SUPPORT; OAuth `refresh_token` + Session-Refresh
+- Queue safeRemove (Temp-Ban, Reminders, Selfroles); `addJobAndAwait` rethrowt Enqueue-Fehler
+- DefaultMemberPermissions für Admin-Commands; Cooldown erst nach erfolgreichem Execute
+- API: BadRequest/Upstream-Errors; Discord Roles/Channels 401/403/429/502
+
+### Manuell testen
+
+- [ ] One-shot Schedule sendet einmal (kein Doppel-Post nach Worker-Retry)
+- [ ] Channel-Dropdown bei API-Fehler: Retry statt permanent „Keine Treffer“
+- [ ] Giveaway Pause im Dashboard → Button disabled; Unpause → Timer weiter; End trotz Pause
+- [ ] Modul aus → Join-Button / Ticket-Panel antwortet „Modul deaktiviert“
+- [ ] VIEWER-Owner ohne Manage Guild: kein Dashboard-Guild-Zugriff; SUPPORT+: Bypass
+- [ ] Session nach Token-Ablauf refresht ohne erzwungenen Re-Login (mit gültigem refresh_token)
+
 ## Post-Phase – Giveaway End Fix + Role Picker (Status: implementiert)
 
 ### Abgeschlossen (Code)