feat: add qdrant vector database client

[yassine1234944-design]

Summary

• Adds a Qdrant vector database wrapper to @arakoodev/edgechains.js/vector-db using Qdrant's REST API.
• Supports collection creation, vector upsert, search, scroll, get-by-id, payload/vector update, and delete-by-id helpers.
• Exports the Qdrant client and public TypeScript types from the vector-db entrypoint.
• Adds focused Vitest coverage for collection creation, upsert, and vector search requests.

/claim #273

How did you test this change?

• npx -y prettier@3.2.5 --check JS/edgechains/arakoodev/src/vector-db/src/lib/qdrant/qdrant.ts JS/edgechains/arakoodev/src/vector-db/src/index.ts JS/edgechains/arakoodev/src/vector-db/src/tests/qdrant/qdrant.test.ts
• npx -y esbuild@0.20.2 JS/edgechains/arakoodev/src/vector-db/src/index.ts --bundle --external:* --format=esm --platform=node --outfile=$env:TEMP\edgechains-vector-db.mjs --log-level=error
• npx -y vitest@2.0.3 run src/vector-db/src/tests/qdrant/qdrant.test.ts -> 3 tests passed
• git diff --check

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[yassine1234944-design]

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[yassine1234944-design]

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[yassine1234944-design]

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