Implement warning system enhancements with unique identifiers

- Added a `warningNumber` field to the `Warning` model for sequential identification of warnings.
- Updated the `createWarning` function to handle the new `warningNumber` logic and notify users via DM upon receiving a warning.
- Refactored moderation commands to utilize the new warning system, including changes to the warning creation and removal processes.
- Enhanced the WebUI to display warning numbers in the warnings table and updated localization for related messages.
- Documented changes in phase tracking to reflect the new warning system features.

apps/webui/src/messages/de.json

@@ -366,7 +366,7 @@
       "deleteCase": "Fall löschen",
       "confirmDeleteCase": "Diesen Fall wirklich löschen?",
       "warningsTitle": "Verwarnungen",
-      "warningsDescription": "Letzte Verwarnungen. Entfernen löscht den Warn-Eintrag.",
+      "warningsDescription": "Letzte Verwarnungen mit kurzer Nummer (#). Entfernen löscht den Warn-Eintrag.",
       "warningsEmpty": "Keine Verwarnungen gefunden.",
       "warningsSearchUser": "User-ID filtern",
       "removeWarning": "Verwarnung entfernen",

apps/webui/src/messages/en.json

@@ -366,7 +366,7 @@
       "deleteCase": "Delete case",
       "confirmDeleteCase": "Really delete this case?",
       "warningsTitle": "Warnings",
-      "warningsDescription": "Recent warnings. Remove deletes the warning entry.",
+      "warningsDescription": "Recent warnings with short numbers (#). Remove deletes the warning entry.",
       "warningsEmpty": "No warnings found.",
       "warningsSearchUser": "Filter by user ID",
       "removeWarning": "Remove warning",