feat(vector-db): add dependency-free Qdrant REST client

[NicoClerckx]

Summary

• add a dependency-free Qdrant REST client to the JavaScript vector-db package
• support collection creation, point upsert, vector search, scrolling, retrieval, payload updates, and deletion
• export Qdrant and its public types alongside the existing Supabase integration
• document a minimal usage example
• add deterministic tests with mocked fetch; no Qdrant account or live server is required

Validation

• npx tsc -b --pretty false
• npx vitest run src/vector-db/src/tests/qdrant/qdrant.test.ts — 4 tests passed
• git diff --check

Demo

A short MP4 demonstrates the exported API, covered operations, successful TypeScript build, and passing tests. Attach edgechains-273-demo.mp4 from the prepared submission package to this PR.

/claim #273

edgechains-273-demo.mp4

[github-actions]

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[NicoClerckx]

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

[NicoClerckx]

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