feat(Moderation): enhance moderation reporting and user feedback

- Added user blocking checks in authentication and reporting processes, returning appropriate error responses.
- Expanded moderation report functionality to include new target types and optional fields for reports.
- Implemented a new API endpoint to retrieve the count of open moderation reports.
- Enhanced frontend components to allow users to report profiles, images, and guestbook entries, with corresponding UI updates.
- Updated internationalization files to include new strings for reporting features in both German and English.

backend/services/adminService.js

@@ -1663,9 +1663,15 @@ class AdminService {
         }
         if (typeof data.active === 'boolean') {
             updates.active = data.active;
+            if (data.active === false) {
+                updates.authCode = null;
+            }
         }
         if (Object.keys(updates).length === 0) return { id: user.hashedId, username: user.username, active: user.active };
         await user.update(updates);
+        if (typeof data.active === 'boolean') {
+            await notifyUser(user.hashedId, 'userAccessChanged', { active: !!data.active });
+        }
         return { id: user.hashedId, username: user.username, active: user.active };
     }