Add Qdrant REST vector client

[Luvi-1]

/claim #273

Summary

• add a dependency-free Qdrant REST client to the JavaScript vector-db package
• support collection creation, point upsert, current /points/query search, retrieval, and deletion
• validate URLs, collection names, vector size, and non-empty point/ID inputs
• forward optional Qdrant API-key authentication and surface HTTP errors
• export the client and public TypeScript types beside Supabase

Validation

• npx tsc -p tsconfig.json --noEmit --incremental false
• npx vitest run src/vector-db/src/tests/qdrant/qdrant.test.ts (3 passed)
• repository Prettier settings passed for every touched file

Closes #273

[github-actions]

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[Luvi-1]

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

[Luvi-1]

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