chore: import clean Agent Desk snapshot (2/7)

internal/ai/rag/vectordb/lancedb_stub.go

@@ -0,0 +1,13 @@
+//go:build !lancedb
+
+package vectordb
+
+import (
+	"fmt"
+
+	"agent-desk/internal/pkg/config"
+)
+
+func NewLanceDBProvider(_ *config.LanceDBVectorDBConfig) (Provider, error) {
+	return nil, fmt.Errorf("LanceDB provider is not built. Rebuild with -tags lancedb and configure LanceDB native libraries")
+}