feat: add Qdrant vector database client

[businesscurry123]

/claim #273

Summary

• Add a dependency-free Qdrant REST client under the JavaScript SDK vector-db package.
• Export Qdrant next to Supabase and keep the existing tableName calling style supported via collectionName fallback.
• Cover collection creation, upsert, search, lookup, delete, and error handling with mocked Vitest tests.
• Add a short Qdrant vector search README example.

Validation

• npx vitest run src/vector-db/src/tests/qdrant/qdrant.test.ts
• npx tsc -b
• 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 ..\examples\qdrant-vector-search\README.md

Note: npm run build reaches the same TypeScript build step but the package script starts with Unix rm -rf, so it is not directly runnable from this Windows shell. npx tsc -b passes.

[github-actions]

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

[businesscurry123]

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

[businesscurry123]

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