Add Qdrant vector database support

[richboyneedcash]

Summary

• add a Qdrant REST wrapper under the vector-db package without introducing a Qdrant SDK dependency
• support collection create/get/delete, point upsert/retrieve/delete, scroll, filtered vector query, and HydeSearch-style retrieval normalization
• export Qdrant, QdrantRestClient, QdrantVectorClient, and QdrantDistanceMetric from vector-db
• document basic collection creation, insert, and query usage with focused Vitest coverage

/claim #273

Fixes #273

Demo

• https://asciinema.org/a/T8VgGCzj6bsTVOpq

Tests

• npm run build
• npm test -- --run src/vector-db/src/tests/qdrant/qdrant.test.ts
• npx prettier --check src/vector-db/src/lib/qdrant/qdrant.ts src/vector-db/src/index.ts src/vector-db/src/tests/qdrant/qdrant.test.ts README.md

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[richboyneedcash]

I have read the Arakoo CLA Document and I hereby sign the CLA

[richboyneedcash]

recheck

[richboyneedcash]

/claim #273

Ready for review. CLA is signed and all PR checks are green. This PR adds direct REST-based Qdrant support without Qdrant SDK dependencies, including collection lifecycle helpers, point upsert/retrieve/delete, scroll/query APIs, HydeSearch-style result normalization, README usage, and focused Vitest coverage.

[richboyneedcash]

Demo: https://asciinema.org/a/T8VgGCzj6bsTVOpq\n\nThis shows the focused Qdrant vector-db test suite and TypeScript build passing for the implementation.