fix(settings): remove api_keys_text and deduplicate API keys

- Delete api_keys_text from settingsToSave before sending to backend to avoid schema issues
- Deduplicate API keys using Set to prevent duplicate entries

Author: localai-bot

core/http/react-ui/src/pages/Settings.jsx

@@ -59,11 +59,14 @@ export default function Settings() {
       const settingsToSave = { ...settings }
       if (settingsToSave.api_keys_text !== undefined && settingsToSave.api_keys_text !== null) {
         const text = settingsToSave.api_keys_text
-        if (typeof text === 'string' && text.trim() !== '') {
-          settingsToSave.api_keys = text.split('\n').map(k => k.trim()).filter(k => k !== '')
+        if (typeof text === 'string' && text.trim() !== '' ) {
+          const keys = text.split('\n').map(k => k.trim()).filter(k => k !== '' );
+          settingsToSave.api_keys = Array.from(new Set(keys))
         } else {
           settingsToSave.api_keys = []
         }
+        // Remove UI-only field before sending to backend
+        delete settingsToSave.api_keys_text
       }
       await settingsApi.save(settingsToSave)
       addToast('Settings saved successfully', 'success')