initial commit: slides ready + upgraded

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# Qdrant - Búsqueda
```typescript
import { QdrantVectorStore } from "@langchain/qdrant";
import { OpenAIEmbeddings } from "@langchain/openai";
// Conectar a colección existente
const vectorStore = await QdrantVectorStore.fromExistingCollection(
new OpenAIEmbeddings(),
{
url: "http://localhost:6333",
collectionName: "langchain_docs",
}
);
// Búsqueda por similitud
const results = await vectorStore.similaritySearch(
"¿Qué es RAG?",
3 // top 3 resultados
);
results.forEach((doc, i) => {
console.log(`${i + 1}. ${doc.pageContent}`);
console.log(` Metadata:`, doc.metadata);
});
```