feat(AdminController, AdminService, AdminRouter, localization): add character death cleanup feature

- Implemented `adminCleanupCharacterDeathArtifacts` method in AdminService to remove stale character-bound data after death/inheritance, including knowledge, debtors prism, and political offices.
- Added corresponding route in AdminRouter for triggering the cleanup process via an API endpoint.
- Enhanced AdminController to handle requests for the new cleanup feature, ensuring proper error handling and response formatting.
- Updated frontend components to include a user interface for initiating the cleanup, with localization support in both English and German for improved user experience.

frontend/src/i18n/locales/de/admin.json

@@ -244,6 +244,14 @@
                     "force": "Geburt auslösen",
                     "success": "Kind wurde angelegt (Taufe ausstehend).",
                     "error": "Geburt konnte nicht ausgelöst werden."
+                },
+                "deathCleanup": {
+                    "title": "Tod/Erbe-Aufräumen (Admin)",
+                    "hint": "Entfernt veraltete charaktergebundene Daten nach Tod/Erbe (Wissen, Schuldnerkartei, politische Ämter inkl. Archiv, Wahlkandidatur).",
+                    "action": "Cleanup ausführen",
+                    "confirm": "Diesen Cleanup für den aktuellen Charakter jetzt ausführen?",
+                    "success": "Cleanup erfolgreich ausgeführt.",
+                    "error": "Cleanup konnte nicht ausgeführt werden."
                 }
             },
             "map": {

frontend/src/i18n/locales/en/admin.json

@@ -299,6 +299,14 @@
                     "force": "Trigger birth",
                     "success": "Child created (baptism pending).",
                     "error": "Could not trigger birth."
+                },
+                "deathCleanup": {
+                    "title": "Death/inheritance cleanup (admin)",
+                    "hint": "Removes stale character-bound data after death/inheritance (knowledge, debtors prism, political offices incl. archive, election candidacy).",
+                    "action": "Run cleanup",
+                    "confirm": "Run this cleanup for the current character now?",
+                    "success": "Cleanup completed successfully.",
+                    "error": "Cleanup failed."
                 }
             },
             "createNPC": {