feat: Multi-Database Support (Pinecone, Qdrant, Weaviate)

[stepandel]

Summary

This PR implements the foundation for multi-database support, allowing the explorer to work with Pinecone, Qdrant, and Weaviate vector databases.

Changes

New Abstraction Layer (electron/adapters/)

• types.ts - Unified type definitions:

  • VectorDatabase interface for all providers
  • DatabaseCapabilities for feature detection
  • Common types: CollectionInfo, VectorRecord, QueryResult, etc.
  • Provider-specific connection configs

• base-adapter.ts - Abstract base class with:

  • Connection lifecycle management
  • Retry logic with exponential backoff
  • Batch utilities
  • Common validations

• factory.ts - Adapter factory:

  • Lazy-loads SDK dependencies
  • Caches adapter instances
  • Provider selection based on config

Provider Adapters

• pinecone-adapter.ts - Pinecone implementation (refactored from existing service)
• qdrant-adapter.ts - New Qdrant implementation
• weaviate-adapter.ts - New Weaviate implementation

Dependencies

"@qdrant/js-client-rest": "^1.16.2"
"weaviate-client": "^3.11.0"

Capabilities Matrix

Feature	Pinecone	Qdrant	Weaviate
Namespaces	✅	❌ (filtering)	✅ (multi-tenancy)
Sparse Vectors	✅	✅	❌
Hybrid Search	✅	✅	✅ (BM25)
Integrated Embeddings	✅	❌	✅
Reranking	✅	❌	❌
Vector Listing	✅	✅	✅

Next Steps

• Update UI to support provider selection (VEX-013)
• Rename hooks/context to be provider-agnostic (VEX-014)
• Add conditional UI features based on capabilities (VEX-015)
• Integration tests for each adapter (VEX-021)

Testing

• TypeScript compilation passes
• Manual testing with each provider
• Unit tests for adapters