migrate article embeddings to support multi-model architecture and enhance data integrity

src/routes/status.js

@@ -11,7 +11,7 @@ async function statusRoutes(fastify) {
         SUM(CASE
           WHEN content IS NOT NULL AND content != ''
             AND is_index_page = 0
-            AND EXISTS (SELECT 1 FROM article_embeddings WHERE article_id = articles.id)
+            AND EXISTS (SELECT 1 FROM article_embedding_meta WHERE article_id = articles.id)
           THEN 1 ELSE 0
         END) AS usable
       FROM articles