feat: add qdrant vector database client

[victordb9997]

Summary

• add a dependency-free Qdrant REST client to the vector-db package
• export Qdrant and its public types alongside Supabase
• cover collection creation, point upsert, search, and delete request behavior with mocked Vitest tests
• add a short Qdrant usage example

Validation

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

/claim #273

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[victordb9997]

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[victordb9997]

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