feat(admin): add OcrHealthBar, OcrStatCards, OcrModelsTable components

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/routes/admin/ocr/OcrHealthBar.svelte

@@ -0,0 +1,14 @@
+<script lang="ts">
+let { ocrServiceAvailable }: { ocrServiceAvailable: boolean } = $props();
+</script>
+
+<div class="flex items-center gap-2">
+	<span
+		class="inline-block h-2.5 w-2.5 rounded-full {ocrServiceAvailable
+			? 'bg-green-500'
+			: 'bg-red-500'}"
+	></span>
+	<span class="text-sm font-medium {ocrServiceAvailable ? 'text-green-700' : 'text-red-700'}">
+		{ocrServiceAvailable ? 'Online' : 'Offline'}
+	</span>
+</div>