Add Ollama embedding support and improve prayer system with public/private visibility

- Add Ollama fallback support in vector search with Azure OpenAI as primary
- Enhance prayer system with public/private visibility options and language filtering
- Update OG image to use new biblical-guide-og-image.png
- Improve prayer request management with better categorization
- Remove deprecated ingest_json_pgvector.py script

🤖 Generated with [Claude Code](https://claude.ai/code)

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

app/[locale]/layout.tsx

@@ -16,6 +16,7 @@ export async function generateMetadata({ params }: { params: Promise<{ locale: s
 
   const currentUrl = locale === 'ro' ? 'https://biblical-guide.com/ro/' : 'https://biblical-guide.com/en/'
   const alternateUrl = locale === 'ro' ? 'https://biblical-guide.com/en/' : 'https://biblical-guide.com/ro/'
+  const ogImageUrl = 'https://biblical-guide.com/biblical-guide-og-image.png'
 
   return {
     title: t('title'),
@@ -38,7 +39,7 @@ export async function generateMetadata({ params }: { params: Promise<{ locale: s
       type: 'website',
       images: [
         {
-          url: `https://ghidulbiblic.ro/og-image-${locale}.jpg`,
+          url: ogImageUrl,
           width: 1200,
           height: 630,
           alt: t('ogTitle'),
@@ -50,7 +51,7 @@ export async function generateMetadata({ params }: { params: Promise<{ locale: s
       site: '@ghidbiblic',
       title: t('twitterTitle'),
       description: t('twitterDescription'),
-      images: [`https://ghidulbiblic.ro/og-image-${locale}.jpg`],
+      images: [ogImageUrl],
     },
     other: {
       'application/ld+json': JSON.stringify({