Add Qdrant HTTP vector database client

[chenmo2532]

Summary

• Adds a Qdrant vector database client using Qdrant's HTTP API through axios, without adding the official Qdrant SDK.
• Supports collection creation/deletion, point upsert, point search, point retrieval, and point deletion.
• Exports the Qdrant client and related TypeScript types from the vector-db package.
• Adds Vitest coverage for client creation and core Qdrant operations.

Verification

• npx tsc -b
• npm test -- --run src/vector-db/src/tests/qdrant/qdrant.test.ts

Closes #273

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[chenmo2532]

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[chenmo2532]

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[chenmo2532]

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[chenmo2532]

/claim #273

Demo: The PR adds a Qdrant HTTP vector database client, exports it from the vector-db package, and includes passing unit tests for client creation, collection creation, upsert, search, and delete operations.