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

src/routes/status.js

@@ -29,8 +29,11 @@ async function statusRoutes(fastify) {
     );
 
     const embeddingModelRows = db.prepare(`
-      SELECT model, COUNT(*) AS article_count
-      FROM article_embedding_store
+      SELECT
+        model,
+        COUNT(*) AS article_count,
+        (SELECT LENGTH(embedding) FROM article_embedding_store s2 WHERE s2.model = s.model LIMIT 1) AS sample_bytes
+      FROM article_embedding_store s
       GROUP BY model
       ORDER BY article_count DESC
     `).all();
@@ -45,6 +48,7 @@ async function statusRoutes(fastify) {
       embeddingModels: embeddingModelRows.map((row) => ({
         model: row.model,
         articles: row.article_count,
+        dimensions: row.sample_bytes ? row.sample_bytes / 4 : null,
       })),
     };
   });