Add Qdrant vector database client

[nguyenduchuyhd]

Closes #273

/claim #273

Summary

• Adds a Qdrant client to the JavaScript vector-db package using direct Qdrant REST API calls with native fetch.
• Exports Qdrant alongside Supabase from the vector-db entrypoint.
• Supports collection create/delete, point insertion, vector search, scroll, read by id, payload update, and delete by id.
• Adds Vitest coverage for collection creation, vector insertion, and vector search.
• Updates the existing vector-db Supabase tests from Jest globals to Vitest mocks so the vector-db test suite runs cleanly.

Verification

• npx tsc -b
• npx vitest run src/vector-db/src/tests

Note

• No qdrant package was added; this uses the Qdrant REST API directly as requested.

[github-actions]

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