chore(release): bump version to 2.0.0

Update the Rust package manifest to 2.0.0 so CLI version
reporting and release-related flows pick up the new version
from Cargo metadata.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mdrs-client-rust"
-version = "0.1.1"
+version = "2.0.0"
 edition = "2024"
 license = "MIT"
 authors = ["Neuroinformatics Unit, RIKEN CBS"]