api (#4892)

# Description of Changes

<img width="1253" height="816" alt="image"
src="https://github.com/user-attachments/assets/51154a0e-4353-4e62-83c5-0896bc4e98df"
/>


---

## 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/devGuide/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
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

frontend/public/locales/en-GB/translation.json

@@ -4650,6 +4650,12 @@
       }
     },
     "apiKeys": {
+      "intro": "Use your API key to programmatically access Stirling PDF's processing capabilities.",
+      "docsTitle": "API Documentation",
+      "docsDescription": "Learn more about integrating with Stirling PDF:",
+      "docsLink": "API Documentation",
+      "schemaLink": "API Schema Reference",
+      "usage": "Include this key in the X-API-KEY header with all API requests.",
       "description": "Your API key for accessing Stirling's suite of PDF tools. Copy it to your project or refresh to generate a new one.",
       "publicKeyAriaLabel": "Public API key",
       "copyKeyAriaLabel": "Copy API key",