chore: sync model metadata (#1421)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

.changeset/sync-models.md

@@ -0,0 +1,6 @@
+---
+'@tanstack/ai-openrouter': patch
+'@tanstack/ai-vercel-gateway': patch
+---
+
+Update model metadata from OpenRouter API