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/views/admin/falukant/EditUserView.vue

@@ -128,6 +128,14 @@
               <div class="action-buttons">
                 <button type="button" @click="adminForceBirth">{{ $t('admin.falukant.edituser.birth.force') }}</button>
               </div>
+
+              <h4>{{ $t('admin.falukant.edituser.deathCleanup.title') }}</h4>
+              <p class="admin-family-tools__hint">{{ $t('admin.falukant.edituser.deathCleanup.hint') }}</p>
+              <div class="action-buttons">
+                <button type="button" class="button-secondary" @click="adminCleanupDeathArtifacts">
+                  {{ $t('admin.falukant.edituser.deathCleanup.action') }}
+                </button>
+              </div>
             </div>
 
             <div class="action-buttons">
@@ -567,6 +575,22 @@ export default {
       } catch (error) {
         showApiError(this, error, 'tr:admin.falukant.edituser.birth.error');
       }
+    },
+    async adminCleanupDeathArtifacts() {
+      const characterId = this.editableUser?.falukantData?.[0]?.character?.id;
+      if (!characterId) {
+        return;
+      }
+      if (!window.confirm(this.$t('admin.falukant.edituser.deathCleanup.confirm'))) {
+        return;
+      }
+      try {
+        await apiClient.post(`/api/admin/falukant/character/${characterId}/death-cleanup`);
+        showSuccess(this, 'tr:admin.falukant.edituser.deathCleanup.success');
+        await this.refreshEditableUser();
+      } catch (error) {
+        showApiError(this, error, 'tr:admin.falukant.edituser.deathCleanup.error');
+      }
     }
   }
 }