refactor(AdminService, EditUserView): streamline character data deletion and enhance confirmation dialog

- Introduced a reusable `deleteIfTableExists` function in AdminService to simplify the deletion of character-related data across multiple tables, improving code maintainability.
- Updated the deletion logic to check for table existence before executing delete queries, enhancing robustness.
- Enhanced the EditUserView by integrating a `ChooseDialog` for user confirmation before proceeding with character death cleanup, improving user experience and interaction clarity.

frontend/src/views/admin/falukant/EditUserView.vue

@@ -213,6 +213,7 @@
         </div>
       </div>
     </div>
+    <ChooseDialog ref="chooseDialog" />
   </div>
 </template>
 
@@ -220,13 +221,15 @@
 import { mapState } from 'vuex';
 import { mapActions } from 'vuex';
 import SimpleTabs from '@/components/SimpleTabs.vue';
+import ChooseDialog from '@/dialogues/standard/ChooseDialog.vue';
 import apiClient from '@/utils/axios.js';
 import { showApiError, showError, showSuccess } from '@/utils/feedback.js';
 
 export default {
   name: 'AdminFalukantEditUserView',
   components: {
-    SimpleTabs
+    SimpleTabs,
+    ChooseDialog
   },
   data() {
     return {
@@ -581,7 +584,11 @@ export default {
       if (!characterId) {
         return;
       }
-      if (!window.confirm(this.$t('admin.falukant.edituser.deathCleanup.confirm'))) {
+      const confirmed = await this.$refs.chooseDialog.open({
+        title: this.$t('common.confirm'),
+        message: this.$t('admin.falukant.edituser.deathCleanup.confirm')
+      });
+      if (!confirmed) {
         return;
       }
       try {