Milvus Snapshots: Point-in-Time Collection Views Without Copying Data

Introduced Milvus Snapshots, a feature that creates point-in-time, read-only views of collections by referencing existing data files instead of copying them. This enables lightweight snapshot creation, fast restores by reusing index files, cross-cluster data movement through metadata URIs, and stable views for external consumers and batch jobs. The implementation leverages the write-once nature of Milvus storage files and records file references and metadata to represent a collection's state at a specific moment. This significantly reduces the cost and time for tasks like rollback, testing, and batch processing.