feat: implementing embedding AI

.env.example

@@ -22,6 +22,9 @@ OPENAI_API_KEY=
 LOCAL_WHISPER_URL=http://localhost:9000
 LOCAL_OLLAMA_URL=http://localhost:11434
 LOCAL_LLM_MODEL=llama3.2:3b
+
+# Embedding Model for semantic search (pgvector)
+EMBEDDING_MODEL=nomic-embed-text
  
 # Mercado Pago Configuration
 MP_ACCESS_TOKEN=