enh: configurable mistral ocr base url

src/lib/components/admin/Settings/Documents.svelte

@@ -766,6 +766,11 @@
 							</div>
 						{:else if RAGConfig.CONTENT_EXTRACTION_ENGINE === 'mistral_ocr'}
 							<div class="my-0.5 flex gap-2 pr-2">
+								<input
+									class="flex-1 w-full text-sm bg-transparent outline-hidden"
+									placeholder={$i18n.t('Enter Mistral API Base URL')}
+									bind:value={RAGConfig.MISTRAL_OCR_API_BASE_URL}
+								/>
 								<SensitiveInput
 									placeholder={$i18n.t('Enter Mistral API Key')}
 									bind:value={RAGConfig.MISTRAL_OCR_API_KEY}