Add Qdrant vector database client

[montfort-systems]

Adds Qdrant support to the JavaScript vector-db package using the Qdrant HTTP API directly, without adding Qdrant client packages.

Implemented:

• Qdrant client export from vector-db
• createCollection
• upsertPoints
• searchPoints
• deletePoints
• API key header support
• HTTP error handling
• Unit tests with mocked fetch

Validation run locally:

• npm run build
• npx vitest run src/vector-db/src/tests/qdrant/qdrant.test.ts

Closes #273

[github-actions]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[montfort-systems]

Structured summary for this PR:

Adds Qdrant support to the JavaScript vector-db package using the Qdrant HTTP API directly, without adding Qdrant client packages.

Implemented:

• Qdrant client export from vector-db
• createCollection
• upsertPoints
• searchPoints
• deletePoints
• API key header support
• HTTP error handling
• Unit tests with mocked fetch

Validation run locally:

• npm run build
• npx vitest run src/vector-db/src/tests/qdrant/qdrant.test.ts

Closes #273

[montfort-systems]

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

[montfort-systems]

recheck