feat: add LanceDB vector database provider

- Implemented LanceDBProvider for managing vector collections, including methods for creating, deleting, and searching collections.
- Added support for LanceDB configuration in VectorDBConfig.
- Introduced stub for LanceDB provider when not built with the appropriate tag.
- Updated provider initialization to include LanceDB as a supported type.
- Created types and interfaces for vector operations, including Vector, SearchRequest, and SearchResult.
- Added tests for VectorDBConfig unmarshalling and for ensuring proper error handling when LanceDB is not built.
- Updated enums to include LanceDB type and labels.
- Modified frontend enums to reflect the addition of LanceDB.

docker/agent-desk.yaml

@@ -46,10 +46,14 @@ storage:
 
 vectorDB:
   type: qdrant
-  host: qdrant
-  grpcPort: 6334
-  apiKey: ""
-  useTls: false
+  qdrant:
+    host: qdrant
+    grpcPort: 6334
+    apiKey: ""
+    useTls: false
+  # LanceDB requires building the backend with -tags lancedb and LanceDB native libraries.
+  lancedb:
+    path: /app/data/lancedb
 
 mcp:
   enabled: true