fix(admin-settings): correctly mask Telegram bot tokens in settings output (#6822)

# Description of Changes

- What was changed
- Fixed the sensitive-field detection logic in `AdminSettingsController`
so `botToken` is matched correctly after lowercasing the field name.
- This ensures Telegram bot tokens are masked consistently in admin
settings responses.
- Why the change was made
- The previous check used `lowerField.contains("botToken")`, which could
never match after converting the field name to lowercase.
- As a result, `botToken` values could remain visible in masked settings
output.

---

## Checklist

### General

- [ ] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [ ] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [ ] I have performed a self-review of my own code
- [ ] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### Translations (if applicable)

- [ ] I ran
[`scripts/counter_translation.py`](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/docs/counter_translation.md)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
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### Testing (if applicable)

- [ ] I have run `task check` to verify linters, typechecks, and tests
pass
- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#7-testing)
for more details.

app/proprietary/src/main/java/stirling/software/proprietary/security/controller/api/AdminSettingsController.java

@@ -843,8 +843,10 @@ public class AdminSettingsController {
             return true;
         }
 
-        // Check for fields containing 'password' or 'secret'
-        return lowerField.contains("password") || lowerField.contains("secret");
+        // Check for fields containing 'password' or 'secret' or 'bottoken'
+        return lowerField.contains("password")
+                || lowerField.contains("secret")
+                || lowerField.contains("bottoken");
     }
 
     /** Create a masked representation for sensitive fields */