feat: add @toon-format/toon dependency and integrate into OpenAI notebooks

- Updated deno.lock and package.json to include @toon-format/toon@^2.1.0.
- Modified background-openai.ipynb to handle error responses and adjust execution counts.
- Enhanced definitions-openai.ipynb to include additional metadata for perishables and origen schemas.
- Refactored embeddings-openai.ipynb to improve error handling and output formatting.
- Updated create-chat-conversation function to append messages and responses to conversations.
- Added SQL functions for appending conversation data to the database.

package.json

@@ -1,6 +1,7 @@
 {
   "dependencies": {
     "@supabase/supabase-js": "^2.90.1",
+    "@toon-format/toon": "^2.1.0",
     "deno": "^2.6.4",
     "openai": "^6.16.0",
     "supabase": "^2.72.6"