refactor: SearchEngine interface, remove nilable qdrantStore

search.go

@@ -0,0 +1,9 @@
+package main
+
+import "context"
+
+type SearchEngine interface {
+	Index(ctx context.Context, id, publicID int64, version int, note string) error
+	Delete(ctx context.Context, id, publicID int64) error
+	Search(ctx context.Context, query string, limit uint64) ([]searchResult, error)
+}