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

internal/ai/rag/index_storage_helpers.go

@@ -0,0 +1,24 @@
+package rag
+
+import (
+	"context"
+	"fmt"
+	"log/slog"
+
+	"agent-desk/internal/ai/rag/vectordb"
+)
+
+func (s *index) ensureCollection(ctx context.Context, provider vectordb.Provider, collectionName string, dimension int) error {
+	collectionInfo, err := provider.GetCollection(ctx, collectionName)
+	if err == nil && collectionInfo != nil {
+		return nil
+	}
+	if dimension <= 0 {
+		return fmt.Errorf("invalid embedding dimension: %d", dimension)
+	}
+	if err := provider.CreateCollection(ctx, collectionName, dimension); err != nil {
+		return fmt.Errorf("failed to create collection: %w", err)
+	}
+	slog.Info("Created collection for knowledge base", "collection", collectionName, "dimension", dimension)
+	return nil
+}