Add Qdrant vector database support

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/claim #273

Summary:

• Adds a dependency-free Qdrant REST client to the JavaScript vector-db package.
• Exports Qdrant alongside Supabase.
• Supports collection creation, upsert, vector search, scroll/retrieve, payload update, and delete-by-id.
• Adds focused mocked Vitest coverage for request shapes, result handling, and REST error details.

Verification:

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

Notes:

• Uses Qdrant API calls directly and does not introduce qdrant npm dependencies.
• The tests provide a reproducible library-level demo without requiring a live Qdrant server.

[github-actions]

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

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

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