Update MinIO bucket configuration and enhance dashboard service caching

- Changed the default MinIO bucket name from "opplens-documents" to "opplens" across multiple configuration files.
- Introduced caching for dashboard statistics in the service layer to improve performance and reduce redundant data fetching.
- Implemented a mutex for thread-safe access to cached statistics, ensuring data integrity during concurrent requests.

This update streamlines the configuration for the AI summarizer and optimizes the dashboard service, enhancing overall system efficiency.

pkg/ai_summarizer/storage.go

@@ -19,7 +19,7 @@ import (
 )
 
 // procedurePrefix is prepended to every contract folder id in the MinIO key.
-// The AI team's storage layout in bucket opplens-documents is:
+// The AI team's storage layout in bucket opplens is:
 //
 //	PROC_<contractFolderID>/<noticePublicationID>/tender.json
 //	PROC_<contractFolderID>/<noticePublicationID>/documents/{files}